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• interface IAccessControl
•    - function hasRole(bytes32 role, addres ...
•    - function getRoleAdmin(bytes32 role)
•    - function grantRole(bytes32 role, addr ...
•    - function revokeRole(bytes32 role, add ...
•    - function renounceRole(bytes32 role, a ...
•    - function _msgSender()
•    - function _msgData()
• interface IERC165
•    - function supportsInterface(bytes4 int ...
•    - function supportsInterface(
• library Math
•    - function max(uint256 a, uint256 b)
•    - function min(uint256 a, uint256 b)
•    - function average(uint256 a, uint256 b ...
•    - function ceilDiv(uint256 a, uint256 b ...
•    - function mulDiv(
•    - function mulDiv(
•    - function sqrt(uint256 a)
•    - function sqrt(uint256 a, Rounding rou ...
•    - function log2(uint256 value)
•    - function log2(
•    - function log10(uint256 value)
•    - function log10(
•    - function log256(uint256 value)
•    - function log256(
• library Strings
•    - function toString(uint256 value)
•    - function toHexString(uint256 value)
•    - function toHexString(
•    - function toHexString(address addr)
•    - function supportsInterface(
•    - function hasRole(
•    - function _checkRole(bytes32 role)
•    - function _checkRole(bytes32 role, add ...
•    - function getRoleAdmin(
•    - function grantRole(
•    - function revokeRole(
•    - function renounceRole(bytes32 role, a ...
•    - function _setupRole(bytes32 role, add ...
•    - function _setRoleAdmin(bytes32 role, ...
•    - function _grantRole(bytes32 role, add ...
•    - function _revokeRole(bytes32 role, ad ...
•    - function owner()
•    - function _checkOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface IERC721 is IERC165
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function safeTransferFrom(
•    - function safeTransferFrom(address fro ...
•    - function transferFrom(address from, a ...
•    - function approve(address to, uint256 ...
•    - function setApprovalForAll(address op ...
•    - function getApproved(
•    - function isApprovedForAll(
• interface IERC721Metadata is IERC721
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
• interface IERC721Receiver
•    - function onERC721Received(
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(
• functionCallWithValue(target, data, 0 ...
•    - function functionCall(
•    - function functionCallWithValue(
• functionCallWithValue(
•    - function functionCallWithValue(
•    - function functionStaticCall(
• functionStaticCall(target, data, & ...
•    - function functionStaticCall(
•    - function functionDelegateCall(
• functionDelegateCall(
•    - function functionDelegateCall(
•    - function verifyCallResultFromTarget(
•    - function verifyCallResult(
•    - function _revert(
•  contract ERC721 is Context, ERC165 ...
•    - function supportsInterface(
•    - function balanceOf(
•    - function ownerOf(
•    - function name()
•    - function symbol()
•    - function tokenURI(
•    - function _baseURI()
•    - function approve(address to, uint256 ...
•    - function getApproved(
•    - function setApprovalForAll(
•    - function isApprovedForAll(
•    - function transferFrom(
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function _safeTransfer(
•    - function _ownerOf(uint256 tokenId)
•    - function _exists(uint256 tokenId)
•    - function _isApprovedOrOwner(
•    - function _safeMint(address to, uint25 ...
•    - function _safeMint(
•    - function _mint(address to, uint256 to ...
•    - function _burn(uint256 tokenId)
•    - function _transfer(
•    - function _approve(address to, uint256 ...
•    - function _setApprovalForAll(
•    - function _requireMinted(uint256 token ...
•    - function _checkOnERC721Received(
•    - function _beforeTokenTransfer(
•    - function _afterTokenTransfer(
•    - function _nonReentrantBefore()
•    - function _nonReentrantAfter()
• library MerkleProof
•    - function verify(
•    - function verifyCalldata(
•    - function processProof(
•    - function processProofCalldata(
•    - function multiProofVerify(
•    - function multiProofVerifyCalldata(
•    - function processMultiProof(
•    - function processMultiProofCalldata(
•    - function _hashPair(bytes32 a, bytes32 ...
•    - function _efficientHash(
• interface IOperatorFilterRegistry
•    - function isOperatorAllowed(
•    - function register(address registrant)
•    - function registerAndSubscribe(
•    - function registerAndCopyEntries(
•    - function unregister(address addr)
•    - function updateOperator(
•    - function updateOperators(
•    - function updateCodeHash(
•    - function updateCodeHashes(
•    - function subscribe(
•    - function unsubscribe(address registra ...
•    - function subscriptionOf(address addr)
•    - function subscribers(address registra ...
•    - function subscriberAt(
•    - function copyEntriesOf(address regist ...
•    - function isOperatorFiltered(
•    - function isCodeHashOfFiltered(
•    - function isCodeHashFiltered(
•    - function filteredOperators(address ad ...
•    - function filteredCodeHashes(address a ...
•    - function filteredOperatorAt(
•    - function filteredCodeHashAt(
•    - function isRegistered(address addr)
•    - function codeHashOf(address addr)
•    - function updateOperatorFilterRegistry ...
•    - function owner()
•    - function _checkFilterOperator(address ...
•    - function updateOperatorFilterRegistry ...
•    - function revokeOperatorFilterRegistry ...
•  contract Andrew_Mitchell_Decal is *
•    - function setArtist(address _artist)
•    - function setArtistMaxSupply(
•    - function setMerkleRoot(
•    - function setBaseUri(
•    - function mint(
•    - function artistMintForAdmin(
•    - function artistMint(uint256 _numberOf ...
•    - function publicSupplyRemaining()
•    - function artistSupplyRemaining()
•    - function tokenURI(
•    - function getTokensOfOwner(
•    - function supportsInterface(
•    - function _baseURI()
•    - function setApprovalForAll(
•    - function approve(
•    - function transferFrom(
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function owner()

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/**
 *Submitted for verification at Etherscan.io on 2023-06-30
*/

// File @openzeppelin/contracts/access/[email protected]

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
  /**
   * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
   *
   * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
   * {RoleAdminChanged} not being emitted signaling this.
   *
   * _Available since v3.1._
   */
  event RoleAdminChanged(
    bytes32 indexed role,
    bytes32 indexed previousAdminRole,
    bytes32 indexed newAdminRole
  );

  /**
   * @dev Emitted when `account` is granted `role`.
   *
   * `sender` is the account that originated the contract call, an admin role
   * bearer except when using {AccessControl-_setupRole}.
   */
  event RoleGranted(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );

  /**
   * @dev Emitted when `account` is revoked `role`.
   *
   * `sender` is the account that originated the contract call:
   *   - if using `revokeRole`, it is the admin role bearer
   *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
   */
  event RoleRevoked(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );

  /**
   * @dev Returns `true` if `account` has been granted `role`.
   */
  function hasRole(bytes32 role, address account) external view returns (bool);

  /**
   * @dev Returns the admin role that controls `role`. See {grantRole} and
   * {revokeRole}.
   *
   * To change a role's admin, use {AccessControl-_setRoleAdmin}.
   */
  function getRoleAdmin(bytes32 role) external view returns (bytes32);

  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function grantRole(bytes32 role, address account) external;

  /**
   * @dev Revokes `role` from `account`.
   *
   * If `account` had been granted `role`, emits a {RoleRevoked} event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function revokeRole(bytes32 role, address account) external;

  /**
   * @dev Revokes `role` from the calling account.
   *
   * Roles are often managed via {grantRole} and {revokeRole}: this function's
   * purpose is to provide a mechanism for accounts to lose their privileges
   * if they are compromised (such as when a trusted device is misplaced).
   *
   * If the calling account had been granted `role`, emits a {RoleRevoked}
   * event.
   *
   * Requirements:
   *
   * - the caller must be `account`.
   */
  function renounceRole(bytes32 role, address account) external;
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
  function _msgSender() internal view virtual returns (address) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes calldata) {
    return msg.data;
  }
}

// File @openzeppelin/contracts/utils/introspection/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
  /**
   * @dev Returns true if this contract implements the interface defined by
   * `interfaceId`. See the corresponding
   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
   * to learn more about how these ids are created.
   *
   * This function call must use less than 30 000 gas.
   */
  function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File @openzeppelin/contracts/utils/introspection/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override returns (bool) {
    return interfaceId == type(IERC165).interfaceId;
  }
}

// File @openzeppelin/contracts/utils/math/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
  enum Rounding {
    Down, // Toward negative infinity
    Up, // Toward infinity
    Zero // Toward zero
  }

  /**
   * @dev Returns the largest of two numbers.
   */
  function max(uint256 a, uint256 b) internal pure returns (uint256) {
    return a > b ? a : b;
  }

  /**
   * @dev Returns the smallest of two numbers.
   */
  function min(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }

  /**
   * @dev Returns the average of two numbers. The result is rounded towards
   * zero.
   */
  function average(uint256 a, uint256 b) internal pure returns (uint256) {
    // (a + b) / 2 can overflow.
    return (a & b) + (a ^ b) / 2;
  }

  /**
   * @dev Returns the ceiling of the division of two numbers.
   *
   * This differs from standard division with `/` in that it rounds up instead
   * of rounding down.
   */
  function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    // (a + b - 1) / b can overflow on addition, so we distribute.
    return a == 0 ? 0 : (a - 1) / b + 1;
  }

  /**
   * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
   * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
   * with further edits by Uniswap Labs also under MIT license.
   */
  function mulDiv(
    uint256 x,
    uint256 y,
    uint256 denominator
  ) internal pure returns (uint256 result) {
    unchecked {
      // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
      // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
      // variables such that product = prod1 * 2^256 + prod0.
      uint256 prod0; // Least significant 256 bits of the product
      uint256 prod1; // Most significant 256 bits of the product
      assembly {
        let mm := mulmod(x, y, not(0))
        prod0 := mul(x, y)
        prod1 := sub(sub(mm, prod0), lt(mm, prod0))
      }

      // Handle non-overflow cases, 256 by 256 division.
      if (prod1 == 0) {
        return prod0 / denominator;
      }

      // Make sure the result is less than 2^256. Also prevents denominator == 0.
      require(denominator > prod1);

      ///////////////////////////////////////////////
      // 512 by 256 division.
      ///////////////////////////////////////////////

      // Make division exact by subtracting the remainder from [prod1 prod0].
      uint256 remainder;
      assembly {
        // Compute remainder using mulmod.
        remainder := mulmod(x, y, denominator)

        // Subtract 256 bit number from 512 bit number.
        prod1 := sub(prod1, gt(remainder, prod0))
        prod0 := sub(prod0, remainder)
      }

      // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
      // See https://cs.stackexchange.com/q/138556/92363.

      // Does not overflow because the denominator cannot be zero at this stage in the function.
      uint256 twos = denominator & (~denominator + 1);
      assembly {
        // Divide denominator by twos.
        denominator := div(denominator, twos)

        // Divide [prod1 prod0] by twos.
        prod0 := div(prod0, twos)

        // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
        twos := add(div(sub(0, twos), twos), 1)
      }

      // Shift in bits from prod1 into prod0.
      prod0 |= prod1 * twos;

      // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
      // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
      // four bits. That is, denominator * inv = 1 mod 2^4.
      uint256 inverse = (3 * denominator) ^ 2;

      // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
      // in modular arithmetic, doubling the correct bits in each step.
      inverse *= 2 - denominator * inverse; // inverse mod 2^8
      inverse *= 2 - denominator * inverse; // inverse mod 2^16
      inverse *= 2 - denominator * inverse; // inverse mod 2^32
      inverse *= 2 - denominator * inverse; // inverse mod 2^64
      inverse *= 2 - denominator * inverse; // inverse mod 2^128
      inverse *= 2 - denominator * inverse; // inverse mod 2^256

      // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
      // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
      // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
      // is no longer required.
      result = prod0 * inverse;
      return result;
    }
  }

  /**
   * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
   */
  function mulDiv(
    uint256 x,
    uint256 y,
    uint256 denominator,
    Rounding rounding
  ) internal pure returns (uint256) {
    uint256 result = mulDiv(x, y, denominator);
    if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
      result += 1;
    }
    return result;
  }

  /**
   * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
   *
   * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
   */
  function sqrt(uint256 a) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }

    // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
    //
    // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
    // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
    //
    // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
    // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
    // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
    //
    // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
    uint256 result = 1 << (log2(a) >> 1);

    // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
    // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
    // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
    // into the expected uint128 result.
    unchecked {
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      result = (result + a / result) >> 1;
      return min(result, a / result);
    }
  }

  /**
   * @notice Calculates sqrt(a), following the selected rounding direction.
   */
  function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
    unchecked {
      uint256 result = sqrt(a);
      return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
    }
  }

  /**
   * @dev Return the log in base 2, rounded down, of a positive value.
   * Returns 0 if given 0.
   */
  function log2(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
      if (value >> 128 > 0) {
        value >>= 128;
        result += 128;
      }
      if (value >> 64 > 0) {
        value >>= 64;
        result += 64;
      }
      if (value >> 32 > 0) {
        value >>= 32;
        result += 32;
      }
      if (value >> 16 > 0) {
        value >>= 16;
        result += 16;
      }
      if (value >> 8 > 0) {
        value >>= 8;
        result += 8;
      }
      if (value >> 4 > 0) {
        value >>= 4;
        result += 4;
      }
      if (value >> 2 > 0) {
        value >>= 2;
        result += 2;
      }
      if (value >> 1 > 0) {
        result += 1;
      }
    }
    return result;
  }

  /**
   * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
   * Returns 0 if given 0.
   */
  function log2(
    uint256 value,
    Rounding rounding
  ) internal pure returns (uint256) {
    unchecked {
      uint256 result = log2(value);
      return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
    }
  }

  /**
   * @dev Return the log in base 10, rounded down, of a positive value.
   * Returns 0 if given 0.
   */
  function log10(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
      if (value >= 10 ** 64) {
        value /= 10 ** 64;
        result += 64;
      }
      if (value >= 10 ** 32) {
        value /= 10 ** 32;
        result += 32;
      }
      if (value >= 10 ** 16) {
        value /= 10 ** 16;
        result += 16;
      }
      if (value >= 10 ** 8) {
        value /= 10 ** 8;
        result += 8;
      }
      if (value >= 10 ** 4) {
        value /= 10 ** 4;
        result += 4;
      }
      if (value >= 10 ** 2) {
        value /= 10 ** 2;
        result += 2;
      }
      if (value >= 10 ** 1) {
        result += 1;
      }
    }
    return result;
  }

  /**
   * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
   * Returns 0 if given 0.
   */
  function log10(
    uint256 value,
    Rounding rounding
  ) internal pure returns (uint256) {
    unchecked {
      uint256 result = log10(value);
      return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
    }
  }

  /**
   * @dev Return the log in base 256, rounded down, of a positive value.
   * Returns 0 if given 0.
   *
   * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
   */
  function log256(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
      if (value >> 128 > 0) {
        value >>= 128;
        result += 16;
      }
      if (value >> 64 > 0) {
        value >>= 64;
        result += 8;
      }
      if (value >> 32 > 0) {
        value >>= 32;
        result += 4;
      }
      if (value >> 16 > 0) {
        value >>= 16;
        result += 2;
      }
      if (value >> 8 > 0) {
        result += 1;
      }
    }
    return result;
  }

  /**
   * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
   * Returns 0 if given 0.
   */
  function log256(
    uint256 value,
    Rounding rounding
  ) internal pure returns (uint256) {
    unchecked {
      uint256 result = log256(value);
      return
        result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
    }
  }
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
  bytes16 private constant _SYMBOLS = "0123456789abcdef";
  uint8 private constant _ADDRESS_LENGTH = 20;

  /**
   * @dev Converts a `uint256` to its ASCII `string` decimal representation.
   */
  function toString(uint256 value) internal pure returns (string memory) {
    unchecked {
      uint256 length = Math.log10(value) + 1;
      string memory buffer = new string(length);
      uint256 ptr;
      /// @solidity memory-safe-assembly
      assembly {
        ptr := add(buffer, add(32, length))
      }
      while (true) {
        ptr--;
        /// @solidity memory-safe-assembly
        assembly {
          mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
        }
        value /= 10;
        if (value == 0) break;
      }
      return buffer;
    }
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
   */
  function toHexString(uint256 value) internal pure returns (string memory) {
    unchecked {
      return toHexString(value, Math.log256(value) + 1);
    }
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
   */
  function toHexString(
    uint256 value,
    uint256 length
  ) internal pure returns (string memory) {
    bytes memory buffer = new bytes(2 * length + 2);
    buffer[0] = "0";
    buffer[1] = "x";
    for (uint256 i = 2 * length + 1; i > 1; --i) {
      buffer[i] = _SYMBOLS[value & 0xf];
      value >>= 4;
    }
    require(value == 0, "Strings: hex length insufficient");
    return string(buffer);
  }

  /**
   * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
   */
  function toHexString(address addr) internal pure returns (string memory) {
    return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
  }
}

// File @openzeppelin/contracts/access/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
  struct RoleData {
    mapping(address => bool) members;
    bytes32 adminRole;
  }

  mapping(bytes32 => RoleData) private _roles;

  bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

  /**
   * @dev Modifier that checks that an account has a specific role. Reverts
   * with a standardized message including the required role.
   *
   * The format of the revert reason is given by the following regular expression:
   *
   *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
   *
   * _Available since v4.1._
   */
  modifier onlyRole(bytes32 role) {
    _checkRole(role);
    _;
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override returns (bool) {
    return
      interfaceId == type(IAccessControl).interfaceId ||
      super.supportsInterface(interfaceId);
  }

  /**
   * @dev Returns `true` if `account` has been granted `role`.
   */
  function hasRole(
    bytes32 role,
    address account
  ) public view virtual override returns (bool) {
    return _roles[role].members[account];
  }

  /**
   * @dev Revert with a standard message if `_msgSender()` is missing `role`.
   * Overriding this function changes the behavior of the {onlyRole} modifier.
   *
   * Format of the revert message is described in {_checkRole}.
   *
   * _Available since v4.6._
   */
  function _checkRole(bytes32 role) internal view virtual {
    _checkRole(role, _msgSender());
  }

  /**
   * @dev Revert with a standard message if `account` is missing `role`.
   *
   * The format of the revert reason is given by the following regular expression:
   *
   *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
   */
  function _checkRole(bytes32 role, address account) internal view virtual {
    if (!hasRole(role, account)) {
      revert(
        string(
          abi.encodePacked(
            "AccessControl: account ",
            Strings.toHexString(account),
            " is missing role ",
            Strings.toHexString(uint256(role), 32)
          )
        )
      );
    }
  }

  /**
   * @dev Returns the admin role that controls `role`. See {grantRole} and
   * {revokeRole}.
   *
   * To change a role's admin, use {_setRoleAdmin}.
   */
  function getRoleAdmin(
    bytes32 role
  ) public view virtual override returns (bytes32) {
    return _roles[role].adminRole;
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   *
   * May emit a {RoleGranted} event.
   */
  function grantRole(
    bytes32 role,
    address account
  ) public virtual override onlyRole(getRoleAdmin(role)) {
    _grantRole(role, account);
  }

  /**
   * @dev Revokes `role` from `account`.
   *
   * If `account` had been granted `role`, emits a {RoleRevoked} event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   *
   * May emit a {RoleRevoked} event.
   */
  function revokeRole(
    bytes32 role,
    address account
  ) public virtual override onlyRole(getRoleAdmin(role)) {
    _revokeRole(role, account);
  }

  /**
   * @dev Revokes `role` from the calling account.
   *
   * Roles are often managed via {grantRole} and {revokeRole}: this function's
   * purpose is to provide a mechanism for accounts to lose their privileges
   * if they are compromised (such as when a trusted device is misplaced).
   *
   * If the calling account had been revoked `role`, emits a {RoleRevoked}
   * event.
   *
   * Requirements:
   *
   * - the caller must be `account`.
   *
   * May emit a {RoleRevoked} event.
   */
  function renounceRole(bytes32 role, address account) public virtual override {
    require(
      account == _msgSender(),
      "AccessControl: can only renounce roles for self"
    );

    _revokeRole(role, account);
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event. Note that unlike {grantRole}, this function doesn't perform any
   * checks on the calling account.
   *
   * May emit a {RoleGranted} event.
   *
   * [WARNING]
   * ====
   * This function should only be called from the constructor when setting
   * up the initial roles for the system.
   *
   * Using this function in any other way is effectively circumventing the admin
   * system imposed by {AccessControl}.
   * ====
   *
   * NOTE: This function is deprecated in favor of {_grantRole}.
   */
  function _setupRole(bytes32 role, address account) internal virtual {
    _grantRole(role, account);
  }

  /**
   * @dev Sets `adminRole` as ``role``'s admin role.
   *
   * Emits a {RoleAdminChanged} event.
   */
  function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
    bytes32 previousAdminRole = getRoleAdmin(role);
    _roles[role].adminRole = adminRole;
    emit RoleAdminChanged(role, previousAdminRole, adminRole);
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * Internal function without access restriction.
   *
   * May emit a {RoleGranted} event.
   */
  function _grantRole(bytes32 role, address account) internal virtual {
    if (!hasRole(role, account)) {
      _roles[role].members[account] = true;
      emit RoleGranted(role, account, _msgSender());
    }
  }

  /**
   * @dev Revokes `role` from `account`.
   *
   * Internal function without access restriction.
   *
   * May emit a {RoleRevoked} event.
   */
  function _revokeRole(bytes32 role, address account) internal virtual {
    if (hasRole(role, account)) {
      _roles[role].members[account] = false;
      emit RoleRevoked(role, account, _msgSender());
    }
  }
}

// File @openzeppelin/contracts/access/[email protected]

// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
  address private _owner;

  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  constructor() {
    _transferOwnership(_msgSender());
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    _checkOwner();
    _;
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view virtual returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if the sender is not the owner.
   */
  function _checkOwner() internal view virtual {
    require(owner() == _msgSender(), "Ownable: caller is not the owner");
  }

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() public virtual onlyOwner {
    _transferOwnership(address(0));
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) public virtual onlyOwner {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Internal function without access restriction.
   */
  function _transferOwnership(address newOwner) internal virtual {
    address oldOwner = _owner;
    _owner = newOwner;
    emit OwnershipTransferred(oldOwner, newOwner);
  }
}

// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
  /**
   * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
   */
  event Transfer(
    address indexed from,
    address indexed to,
    uint256 indexed tokenId
  );

  /**
   * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
   */
  event Approval(
    address indexed owner,
    address indexed approved,
    uint256 indexed tokenId
  );

  /**
   * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
   */
  event ApprovalForAll(
    address indexed owner,
    address indexed operator,
    bool approved
  );

  /**
   * @dev Returns the number of tokens in ``owner``'s account.
   */
  function balanceOf(address owner) external view returns (uint256 balance);

  /**
   * @dev Returns the owner of the `tokenId` token.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   */
  function ownerOf(uint256 tokenId) external view returns (address owner);

  /**
   * @dev Safely transfers `tokenId` token from `from` to `to`.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `tokenId` token must exist and be owned by `from`.
   * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes calldata data
  ) external;

  /**
   * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
   * are aware of the ERC721 protocol to prevent tokens from being forever locked.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `tokenId` token must exist and be owned by `from`.
   * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function safeTransferFrom(address from, address to, uint256 tokenId) external;

  /**
   * @dev Transfers `tokenId` token from `from` to `to`.
   *
   * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
   * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
   * understand this adds an external call which potentially creates a reentrancy vulnerability.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `tokenId` token must be owned by `from`.
   * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address from, address to, uint256 tokenId) external;

  /**
   * @dev Gives permission to `to` to transfer `tokenId` token to another account.
   * The approval is cleared when the token is transferred.
   *
   * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
   *
   * Requirements:
   *
   * - The caller must own the token or be an approved operator.
   * - `tokenId` must exist.
   *
   * Emits an {Approval} event.
   */
  function approve(address to, uint256 tokenId) external;

  /**
   * @dev Approve or remove `operator` as an operator for the caller.
   * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
   *
   * Requirements:
   *
   * - The `operator` cannot be the caller.
   *
   * Emits an {ApprovalForAll} event.
   */
  function setApprovalForAll(address operator, bool approved) external;

  /**
   * @dev Returns the account approved for `tokenId` token.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   */
  function getApproved(
    uint256 tokenId
  ) external view returns (address operator);

  /**
   * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
   *
   * See {setApprovalForAll}
   */
  function isApprovedForAll(
    address owner,
    address operator
  ) external view returns (bool);
}

// File @openzeppelin/contracts/token/ERC721/extensions/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
  /**
   * @dev Returns the token collection name.
   */
  function name() external view returns (string memory);

  /**
   * @dev Returns the token collection symbol.
   */
  function symbol() external view returns (string memory);

  /**
   * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
   */
  function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
  /**
   * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
   * by `operator` from `from`, this function is called.
   *
   * It must return its Solidity selector to confirm the token transfer.
   * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
   *
   * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
   */
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external returns (bytes4);
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   *
   * [IMPORTANT]
   * ====
   * You shouldn't rely on `isContract` to protect against flash loan attacks!
   *
   * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
   * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
   * constructor.
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // This method relies on extcodesize/address.code.length, which returns 0
    // for contracts in construction, since the code is only stored at the end
    // of the constructor execution.

    return account.code.length > 0;
  }

  /**
   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
   * `recipient`, forwarding all available gas and reverting on errors.
   *
   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
   * of certain opcodes, possibly making contracts go over the 2300 gas limit
   * imposed by `transfer`, making them unable to receive funds via
   * `transfer`. {sendValue} removes this limitation.
   *
   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
   *
   * IMPORTANT: because control is transferred to `recipient`, care must be
   * taken to not create reentrancy vulnerabilities. Consider using
   * {ReentrancyGuard} or the
   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
   */
  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, "Address: insufficient balance");

    (bool success, ) = recipient.call{value: amount}("");
    require(
      success,
      "Address: unable to send value, recipient may have reverted"
    );
  }

  /**
   * @dev Performs a Solidity function call using a low level `call`. A
   * plain `call` is an unsafe replacement for a function call: use this
   * function instead.
   *
   * If `target` reverts with a revert reason, it is bubbled up by this
   * function (like regular Solidity function calls).
   *
   * Returns the raw returned data. To convert to the expected return value,
   * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
   *
   * Requirements:
   *
   * - `target` must be a contract.
   * - calling `target` with `data` must not revert.
   *
   * _Available since v3.1._
   */
  function functionCall(
    address target,
    bytes memory data
  ) internal returns (bytes memory) {
    return
      functionCallWithValue(target, data, 0, "Address: low-level call failed");
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
   * `errorMessage` as a fallback revert reason when `target` reverts.
   *
   * _Available since v3.1._
   */
  function functionCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    return functionCallWithValue(target, data, 0, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but also transferring `value` wei to `target`.
   *
   * Requirements:
   *
   * - the calling contract must have an ETH balance of at least `value`.
   * - the called Solidity function must be `payable`.
   *
   * _Available since v3.1._
   */
  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value
  ) internal returns (bytes memory) {
    return
      functionCallWithValue(
        target,
        data,
        value,
        "Address: low-level call with value failed"
      );
  }

  /**
   * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
   * with `errorMessage` as a fallback revert reason when `target` reverts.
   *
   * _Available since v3.1._
   */
  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value,
    string memory errorMessage
  ) internal returns (bytes memory) {
    require(
      address(this).balance >= value,
      "Address: insufficient balance for call"
    );
    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return
      verifyCallResultFromTarget(target, success, returndata, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(
    address target,
    bytes memory data
  ) internal view returns (bytes memory) {
    return
      functionStaticCall(target, data, "Address: low-level static call failed");
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    (bool success, bytes memory returndata) = target.staticcall(data);
    return
      verifyCallResultFromTarget(target, success, returndata, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but performing a delegate call.
   *
   * _Available since v3.4._
   */
  function functionDelegateCall(
    address target,
    bytes memory data
  ) internal returns (bytes memory) {
    return
      functionDelegateCall(
        target,
        data,
        "Address: low-level delegate call failed"
      );
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
   * but performing a delegate call.
   *
   * _Available since v3.4._
   */
  function functionDelegateCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    (bool success, bytes memory returndata) = target.delegatecall(data);
    return
      verifyCallResultFromTarget(target, success, returndata, errorMessage);
  }

  /**
   * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
   * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
   *
   * _Available since v4.8._
   */
  function verifyCallResultFromTarget(
    address target,
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    if (success) {
      if (returndata.length == 0) {
        // only check isContract if the call was successful and the return data is empty
        // otherwise we already know that it was a contract
        require(isContract(target), "Address: call to non-contract");
      }
      return returndata;
    } else {
      _revert(returndata, errorMessage);
    }
  }

  /**
   * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
   * revert reason or using the provided one.
   *
   * _Available since v4.3._
   */
  function verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal pure returns (bytes memory) {
    if (success) {
      return returndata;
    } else {
      _revert(returndata, errorMessage);
    }
  }

  function _revert(
    bytes memory returndata,
    string memory errorMessage
  ) private pure {
    // Look for revert reason and bubble it up if present
    if (returndata.length > 0) {
      // The easiest way to bubble the revert reason is using memory via assembly
      /// @solidity memory-safe-assembly
      assembly {
        let returndata_size := mload(returndata)
        revert(add(32, returndata), returndata_size)
      }
    } else {
      revert(errorMessage);
    }
  }
}

// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
  using Address for address;
  using Strings for uint256;

  // Token name
  string private _name;

  // Token symbol
  string private _symbol;

  // Mapping from token ID to owner address
  mapping(uint256 => address) private _owners;

  // Mapping owner address to token count
  mapping(address => uint256) private _balances;

  // Mapping from token ID to approved address
  mapping(uint256 => address) private _tokenApprovals;

  // Mapping from owner to operator approvals
  mapping(address => mapping(address => bool)) private _operatorApprovals;

  /**
   * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
   */
  constructor(string memory name_, string memory symbol_) {
    _name = name_;
    _symbol = symbol_;
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override(ERC165, IERC165) returns (bool) {
    return
      interfaceId == type(IERC721).interfaceId ||
      interfaceId == type(IERC721Metadata).interfaceId ||
      super.supportsInterface(interfaceId);
  }

  /**
   * @dev See {IERC721-balanceOf}.
   */
  function balanceOf(
    address owner
  ) public view virtual override returns (uint256) {
    require(owner != address(0), "ERC721: address zero is not a valid owner");
    return _balances[owner];
  }

  /**
   * @dev See {IERC721-ownerOf}.
   */
  function ownerOf(
    uint256 tokenId
  ) public view virtual override returns (address) {
    address owner = _ownerOf(tokenId);
    require(owner != address(0), "ERC721: invalid token ID");
    return owner;
  }

  /**
   * @dev See {IERC721Metadata-name}.
   */
  function name() public view virtual override returns (string memory) {
    return _name;
  }

  /**
   * @dev See {IERC721Metadata-symbol}.
   */
  function symbol() public view virtual override returns (string memory) {
    return _symbol;
  }

  /**
   * @dev See {IERC721Metadata-tokenURI}.
   */
  function tokenURI(
    uint256 tokenId
  ) public view virtual override returns (string memory) {
    _requireMinted(tokenId);

    string memory baseURI = _baseURI();
    return
      bytes(baseURI).length > 0
        ? string(abi.encodePacked(baseURI, tokenId.toString()))
        : "";
  }

  /**
   * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
   * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
   * by default, can be overridden in child contracts.
   */
  function _baseURI() internal view virtual returns (string memory) {
    return "";
  }

  /**
   * @dev See {IERC721-approve}.
   */
  function approve(address to, uint256 tokenId) public virtual override {
    address owner = ERC721.ownerOf(tokenId);
    require(to != owner, "ERC721: approval to current owner");

    require(
      _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
      "ERC721: approve caller is not token owner or approved for all"
    );

    _approve(to, tokenId);
  }

  /**
   * @dev See {IERC721-getApproved}.
   */
  function getApproved(
    uint256 tokenId
  ) public view virtual override returns (address) {
    _requireMinted(tokenId);

    return _tokenApprovals[tokenId];
  }

  /**
   * @dev See {IERC721-setApprovalForAll}.
   */
  function setApprovalForAll(
    address operator,
    bool approved
  ) public virtual override {
    _setApprovalForAll(_msgSender(), operator, approved);
  }

  /**
   * @dev See {IERC721-isApprovedForAll}.
   */
  function isApprovedForAll(
    address owner,
    address operator
  ) public view virtual override returns (bool) {
    return _operatorApprovals[owner][operator];
  }

  /**
   * @dev See {IERC721-transferFrom}.
   */
  function transferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override {
    //solhint-disable-next-line max-line-length
    require(
      _isApprovedOrOwner(_msgSender(), tokenId),
      "ERC721: caller is not token owner or approved"
    );

    _transfer(from, to, tokenId);
  }

  /**
   * @dev See {IERC721-safeTransferFrom}.
   */
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override {
    safeTransferFrom(from, to, tokenId, "");
  }

  /**
   * @dev See {IERC721-safeTransferFrom}.
   */
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes memory data
  ) public virtual override {
    require(
      _isApprovedOrOwner(_msgSender(), tokenId),
      "ERC721: caller is not token owner or approved"
    );
    _safeTransfer(from, to, tokenId, data);
  }

  /**
   * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
   * are aware of the ERC721 protocol to prevent tokens from being forever locked.
   *
   * `data` is additional data, it has no specified format and it is sent in call to `to`.
   *
   * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
   * implement alternative mechanisms to perform token transfer, such as signature-based.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `tokenId` token must exist and be owned by `from`.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function _safeTransfer(
    address from,
    address to,
    uint256 tokenId,
    bytes memory data
  ) internal virtual {
    _transfer(from, to, tokenId);
    require(
      _checkOnERC721Received(from, to, tokenId, data),
      "ERC721: transfer to non ERC721Receiver implementer"
    );
  }

  /**
   * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
   */
  function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
    return _owners[tokenId];
  }

  /**
   * @dev Returns whether `tokenId` exists.
   *
   * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
   *
   * Tokens start existing when they are minted (`_mint`),
   * and stop existing when they are burned (`_burn`).
   */
  function _exists(uint256 tokenId) internal view virtual returns (bool) {
    return _ownerOf(tokenId) != address(0);
  }

  /**
   * @dev Returns whether `spender` is allowed to manage `tokenId`.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   */
  function _isApprovedOrOwner(
    address spender,
    uint256 tokenId
  ) internal view virtual returns (bool) {
    address owner = ERC721.ownerOf(tokenId);
    return (spender == owner ||
      isApprovedForAll(owner, spender) ||
      getApproved(tokenId) == spender);
  }

  /**
   * @dev Safely mints `tokenId` and transfers it to `to`.
   *
   * Requirements:
   *
   * - `tokenId` must not exist.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
  function _safeMint(address to, uint256 tokenId) internal virtual {
    _safeMint(to, tokenId, "");
  }

  /**
   * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
   * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
   */
  function _safeMint(
    address to,
    uint256 tokenId,
    bytes memory data
  ) internal virtual {
    _mint(to, tokenId);
    require(
      _checkOnERC721Received(address(0), to, tokenId, data),
      "ERC721: transfer to non ERC721Receiver implementer"
    );
  }

  /**
   * @dev Mints `tokenId` and transfers it to `to`.
   *
   * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
   *
   * Requirements:
   *
   * - `tokenId` must not exist.
   * - `to` cannot be the zero address.
   *
   * Emits a {Transfer} event.
   */
  function _mint(address to, uint256 tokenId) internal virtual {
    require(to != address(0), "ERC721: mint to the zero address");
    require(!_exists(tokenId), "ERC721: token already minted");

    _beforeTokenTransfer(address(0), to, tokenId, 1);

    // Check that tokenId was not minted by `_beforeTokenTransfer` hook
    require(!_exists(tokenId), "ERC721: token already minted");

    unchecked {
      // Will not overflow unless all 2**256 token ids are minted to the same owner.
      // Given that tokens are minted one by one, it is impossible in practice that
      // this ever happens. Might change if we allow batch minting.
      // The ERC fails to describe this case.
      _balances[to] += 1;
    }

    _owners[tokenId] = to;

    emit Transfer(address(0), to, tokenId);

    _afterTokenTransfer(address(0), to, tokenId, 1);
  }

  /**
   * @dev Destroys `tokenId`.
   * The approval is cleared when the token is burned.
   * This is an internal function that does not check if the sender is authorized to operate on the token.
   *
   * Requirements:
   *
   * - `tokenId` must exist.
   *
   * Emits a {Transfer} event.
   */
  function _burn(uint256 tokenId) internal virtual {
    address owner = ERC721.ownerOf(tokenId);

    _beforeTokenTransfer(owner, address(0), tokenId, 1);

    // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
    owner = ERC721.ownerOf(tokenId);

    // Clear approvals
    delete _tokenApprovals[tokenId];

    unchecked {
      // Cannot overflow, as that would require more tokens to be burned/transferred
      // out than the owner initially received through minting and transferring in.
      _balances[owner] -= 1;
    }
    delete _owners[tokenId];

    emit Transfer(owner, address(0), tokenId);

    _afterTokenTransfer(owner, address(0), tokenId, 1);
  }

  /**
   * @dev Transfers `tokenId` from `from` to `to`.
   *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
   *
   * Requirements:
   *
   * - `to` cannot be the zero address.
   * - `tokenId` token must be owned by `from`.
   *
   * Emits a {Transfer} event.
   */
  function _transfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual {
    require(
      ERC721.ownerOf(tokenId) == from,
      "ERC721: transfer from incorrect owner"
    );
    require(to != address(0), "ERC721: transfer to the zero address");

    _beforeTokenTransfer(from, to, tokenId, 1);

    // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
    require(
      ERC721.ownerOf(tokenId) == from,
      "ERC721: transfer from incorrect owner"
    );

    // Clear approvals from the previous owner
    delete _tokenApprovals[tokenId];

    unchecked {
      // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
      // `from`'s balance is the number of token held, which is at least one before the current
      // transfer.
      // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
      // all 2**256 token ids to be minted, which in practice is impossible.
      _balances[from] -= 1;
      _balances[to] += 1;
    }
    _owners[tokenId] = to;

    emit Transfer(from, to, tokenId);

    _afterTokenTransfer(from, to, tokenId, 1);
  }

  /**
   * @dev Approve `to` to operate on `tokenId`
   *
   * Emits an {Approval} event.
   */
  function _approve(address to, uint256 tokenId) internal virtual {
    _tokenApprovals[tokenId] = to;
    emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
  }

  /**
   * @dev Approve `operator` to operate on all of `owner` tokens
   *
   * Emits an {ApprovalForAll} event.
   */
  function _setApprovalForAll(
    address owner,
    address operator,
    bool approved
  ) internal virtual {
    require(owner != operator, "ERC721: approve to caller");
    _operatorApprovals[owner][operator] = approved;
    emit ApprovalForAll(owner, operator, approved);
  }

  /**
   * @dev Reverts if the `tokenId` has not been minted yet.
   */
  function _requireMinted(uint256 tokenId) internal view virtual {
    require(_exists(tokenId), "ERC721: invalid token ID");
  }

  /**
   * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
   * The call is not executed if the target address is not a contract.
   *
   * @param from address representing the previous owner of the given token ID
   * @param to target address that will receive the tokens
   * @param tokenId uint256 ID of the token to be transferred
   * @param data bytes optional data to send along with the call
   * @return bool whether the call correctly returned the expected magic value
   */
  function _checkOnERC721Received(
    address from,
    address to,
    uint256 tokenId,
    bytes memory data
  ) private returns (bool) {
    if (to.isContract()) {
      try
        IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data)
      returns (bytes4 retval) {
        return retval == IERC721Receiver.onERC721Received.selector;
      } catch (bytes memory reason) {
        if (reason.length == 0) {
          revert("ERC721: transfer to non ERC721Receiver implementer");
        } else {
          /// @solidity memory-safe-assembly
          assembly {
            revert(add(32, reason), mload(reason))
          }
        }
      }
    } else {
      return true;
    }
  }

  /**
   * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
   * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
   *
   * Calling conditions:
   *
   * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
   * - When `from` is zero, the tokens will be minted for `to`.
   * - When `to` is zero, ``from``'s tokens will be burned.
   * - `from` and `to` are never both zero.
   * - `batchSize` is non-zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 /* firstTokenId */,
    uint256 batchSize
  ) internal virtual {
    if (batchSize > 1) {
      if (from != address(0)) {
        _balances[from] -= batchSize;
      }
      if (to != address(0)) {
        _balances[to] += batchSize;
      }
    }
  }

  /**
   * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
   * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
   *
   * Calling conditions:
   *
   * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
   * - When `from` is zero, the tokens were minted for `to`.
   * - When `to` is zero, ``from``'s tokens were burned.
   * - `from` and `to` are never both zero.
   * - `batchSize` is non-zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
  function _afterTokenTransfer(
    address from,
    address to,
    uint256 firstTokenId,
    uint256 batchSize
  ) internal virtual {}
}

// File @openzeppelin/contracts/security/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
  // Booleans are more expensive than uint256 or any type that takes up a full
  // word because each write operation emits an extra SLOAD to first read the
  // slot's contents, replace the bits taken up by the boolean, and then write
  // back. This is the compiler's defense against contract upgrades and
  // pointer aliasing, and it cannot be disabled.

  // The values being non-zero value makes deployment a bit more expensive,
  // but in exchange the refund on every call to nonReentrant will be lower in
  // amount. Since refunds are capped to a percentage of the total
  // transaction's gas, it is best to keep them low in cases like this one, to
  // increase the likelihood of the full refund coming into effect.
  uint256 private constant _NOT_ENTERED = 1;
  uint256 private constant _ENTERED = 2;

  uint256 private _status;

  constructor() {
    _status = _NOT_ENTERED;
  }

  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    _nonReentrantBefore();
    _;
    _nonReentrantAfter();
  }

  function _nonReentrantBefore() private {
    // On the first call to nonReentrant, _status will be _NOT_ENTERED
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
  }

  function _nonReentrantAfter() private {
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
}

// File @openzeppelin/contracts/utils/cryptography/[email protected]

// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
  /**
   * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
   * defined by `root`. For this, a `proof` must be provided, containing
   * sibling hashes on the branch from the leaf to the root of the tree. Each
   * pair of leaves and each pair of pre-images are assumed to be sorted.
   */
  function verify(
    bytes32[] memory proof,
    bytes32 root,
    bytes32 leaf
  ) internal pure returns (bool) {
    return processProof(proof, leaf) == root;
  }

  /**
   * @dev Calldata version of {verify}
   *
   * _Available since v4.7._
   */
  function verifyCalldata(
    bytes32[] calldata proof,
    bytes32 root,
    bytes32 leaf
  ) internal pure returns (bool) {
    return processProofCalldata(proof, leaf) == root;
  }

  /**
   * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
   * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
   * hash matches the root of the tree. When processing the proof, the pairs
   * of leafs & pre-images are assumed to be sorted.
   *
   * _Available since v4.4._
   */
  function processProof(
    bytes32[] memory proof,
    bytes32 leaf
  ) internal pure returns (bytes32) {
    bytes32 computedHash = leaf;
    for (uint256 i = 0; i < proof.length; i++) {
      computedHash = _hashPair(computedHash, proof[i]);
    }
    return computedHash;
  }

  /**
   * @dev Calldata version of {processProof}
   *
   * _Available since v4.7._
   */
  function processProofCalldata(
    bytes32[] calldata proof,
    bytes32 leaf
  ) internal pure returns (bytes32) {
    bytes32 computedHash = leaf;
    for (uint256 i = 0; i < proof.length; i++) {
      computedHash = _hashPair(computedHash, proof[i]);
    }
    return computedHash;
  }

  /**
   * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
   * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
   *
   * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
   *
   * _Available since v4.7._
   */
  function multiProofVerify(
    bytes32[] memory proof,
    bool[] memory proofFlags,
    bytes32 root,
    bytes32[] memory leaves
  ) internal pure returns (bool) {
    return processMultiProof(proof, proofFlags, leaves) == root;
  }

  /**
   * @dev Calldata version of {multiProofVerify}
   *
   * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
   *
   * _Available since v4.7._
   */
  function multiProofVerifyCalldata(
    bytes32[] calldata proof,
    bool[] calldata proofFlags,
    bytes32 root,
    bytes32[] memory leaves
  ) internal pure returns (bool) {
    return processMultiProofCalldata(proof, proofFlags, leaves) == root;
  }

  /**
   * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
   * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
   * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
   * respectively.
   *
   * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
   * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
   * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
   *
   * _Available since v4.7._
   */
  function processMultiProof(
    bytes32[] memory proof,
    bool[] memory proofFlags,
    bytes32[] memory leaves
  ) internal pure returns (bytes32 merkleRoot) {
    // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
    // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
    // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
    // the merkle tree.
    uint256 leavesLen = leaves.length;
    uint256 totalHashes = proofFlags.length;

    // Check proof validity.
    require(
      leavesLen + proof.length - 1 == totalHashes,
      "MerkleProof: invalid multiproof"
    );

    // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
    // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
    bytes32[] memory hashes = new bytes32[](totalHashes);
    uint256 leafPos = 0;
    uint256 hashPos = 0;
    uint256 proofPos = 0;
    // At each step, we compute the next hash using two values:
    // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
    //   get the next hash.
    // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
    //   `proof` array.
    for (uint256 i = 0; i < totalHashes; i++) {
      bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
      bytes32 b = proofFlags[i]
        ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]
        : proof[proofPos++];
      hashes[i] = _hashPair(a, b);
    }

    if (totalHashes > 0) {
      return hashes[totalHashes - 1];
    } else if (leavesLen > 0) {
      return leaves[0];
    } else {
      return proof[0];
    }
  }

  /**
   * @dev Calldata version of {processMultiProof}.
   *
   * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
   *
   * _Available since v4.7._
   */
  function processMultiProofCalldata(
    bytes32[] calldata proof,
    bool[] calldata proofFlags,
    bytes32[] memory leaves
  ) internal pure returns (bytes32 merkleRoot) {
    // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
    // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
    // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
    // the merkle tree.
    uint256 leavesLen = leaves.length;
    uint256 totalHashes = proofFlags.length;

    // Check proof validity.
    require(
      leavesLen + proof.length - 1 == totalHashes,
      "MerkleProof: invalid multiproof"
    );

    // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
    // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
    bytes32[] memory hashes = new bytes32[](totalHashes);
    uint256 leafPos = 0;
    uint256 hashPos = 0;
    uint256 proofPos = 0;
    // At each step, we compute the next hash using two values:
    // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
    //   get the next hash.
    // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
    //   `proof` array.
    for (uint256 i = 0; i < totalHashes; i++) {
      bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
      bytes32 b = proofFlags[i]
        ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]
        : proof[proofPos++];
      hashes[i] = _hashPair(a, b);
    }

    if (totalHashes > 0) {
      return hashes[totalHashes - 1];
    } else if (leavesLen > 0) {
      return leaves[0];
    } else {
      return proof[0];
    }
  }

  function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
    return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
  }

  function _efficientHash(
    bytes32 a,
    bytes32 b
  ) private pure returns (bytes32 value) {
    /// @solidity memory-safe-assembly
    assembly {
      mstore(0x00, a)
      mstore(0x20, b)
      value := keccak256(0x00, 0x40)
    }
  }
}

// File contracts/utils/Errors.sol

pragma solidity ^0.8.17;

error MaxSupplyReached();
error AlreadyMinted();
error NotOnAllowlist();
error CannotMintFromContract();
error NotArtist();
error NoArtist();
error MaxArtistSupplyReached();
error CannotMintZero();
error MaxPublicSupplyReached();

// File contracts/utils/lib/Constants.sol

pragma solidity ^0.8.13;

address constant CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS = 0x000000000000AAeB6D7670E522A718067333cd4E;
address constant CANONICAL_CORI_SUBSCRIPTION = 0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6;

// File contracts/utils/IOperatorFilterRegistry.sol

pragma solidity ^0.8.13;

interface IOperatorFilterRegistry {
  /**
   * @notice Returns true if operator is not filtered for a given token, either by address or codeHash. Also returns
   *         true if supplied registrant address is not registered.
   */
  function isOperatorAllowed(
    address registrant,
    address operator
  ) external view returns (bool);

  /**
   * @notice Registers an address with the registry. May be called by address itself or by EIP-173 owner.
   */
  function register(address registrant) external;

  /**
   * @notice Registers an address with the registry and "subscribes" to another address's filtered operators and codeHashes.
   */
  function registerAndSubscribe(
    address registrant,
    address subscription
  ) external;

  /**
   * @notice Registers an address with the registry and copies the filtered operators and codeHashes from another
   *         address without subscribing.
   */
  function registerAndCopyEntries(
    address registrant,
    address registrantToCopy
  ) external;

  /**
   * @notice Unregisters an address with the registry and removes its subscription. May be called by address itself or by EIP-173 owner.
   *         Note that this does not remove any filtered addresses or codeHashes.
   *         Also note that any subscriptions to this registrant will still be active and follow the existing filtered addresses and codehashes.
   */
  function unregister(address addr) external;

  /**
   * @notice Update an operator address for a registered address - when filtered is true, the operator is filtered.
   */
  function updateOperator(
    address registrant,
    address operator,
    bool filtered
  ) external;

  /**
   * @notice Update multiple operators for a registered address - when filtered is true, the operators will be filtered. Reverts on duplicates.
   */
  function updateOperators(
    address registrant,
    address[] calldata operators,
    bool filtered
  ) external;

  /**
   * @notice Update a codeHash for a registered address - when filtered is true, the codeHash is filtered.
   */
  function updateCodeHash(
    address registrant,
    bytes32 codehash,
    bool filtered
  ) external;

  /**
   * @notice Update multiple codeHashes for a registered address - when filtered is true, the codeHashes will be filtered. Reverts on duplicates.
   */
  function updateCodeHashes(
    address registrant,
    bytes32[] calldata codeHashes,
    bool filtered
  ) external;

  /**
   * @notice Subscribe an address to another registrant's filtered operators and codeHashes. Will remove previous
   *         subscription if present.
   *         Note that accounts with subscriptions may go on to subscribe to other accounts - in this case,
   *         subscriptions will not be forwarded. Instead the former subscription's existing entries will still be
   *         used.
   */
  function subscribe(
    address registrant,
    address registrantToSubscribe
  ) external;

  /**
   * @notice Unsubscribe an address from its current subscribed registrant, and optionally copy its filtered operators and codeHashes.
   */
  function unsubscribe(address registrant, bool copyExistingEntries) external;

  /**
   * @notice Get the subscription address of a given registrant, if any.
   */
  function subscriptionOf(address addr) external returns (address registrant);

  /**
   * @notice Get the set of addresses subscribed to a given registrant.
   *         Note that order is not guaranteed as updates are made.
   */
  function subscribers(address registrant) external returns (address[] memory);

  /**
   * @notice Get the subscriber at a given index in the set of addresses subscribed to a given registrant.
   *         Note that order is not guaranteed as updates are made.
   */
  function subscriberAt(
    address registrant,
    uint256 index
  ) external returns (address);

  /**
   * @notice Copy filtered operators and codeHashes from a different registrantToCopy to addr.
   */
  function copyEntriesOf(address registrant, address registrantToCopy) external;

  /**
   * @notice Returns true if operator is filtered by a given address or its subscription.
   */
  function isOperatorFiltered(
    address registrant,
    address operator
  ) external returns (bool);

  /**
   * @notice Returns true if the hash of an address's code is filtered by a given address or its subscription.
   */
  function isCodeHashOfFiltered(
    address registrant,
    address operatorWithCode
  ) external returns (bool);

  /**
   * @notice Returns true if a codeHash is filtered by a given address or its subscription.
   */
  function isCodeHashFiltered(
    address registrant,
    bytes32 codeHash
  ) external returns (bool);

  /**
   * @notice Returns a list of filtered operators for a given address or its subscription.
   */
  function filteredOperators(address addr) external returns (address[] memory);

  /**
   * @notice Returns the set of filtered codeHashes for a given address or its subscription.
   *         Note that order is not guaranteed as updates are made.
   */
  function filteredCodeHashes(address addr) external returns (bytes32[] memory);

  /**
   * @notice Returns the filtered operator at the given index of the set of filtered operators for a given address or
   *         its subscription.
   *         Note that order is not guaranteed as updates are made.
   */
  function filteredOperatorAt(
    address registrant,
    uint256 index
  ) external returns (address);

  /**
   * @notice Returns the filtered codeHash at the given index of the list of filtered codeHashes for a given address or
   *         its subscription.
   *         Note that order is not guaranteed as updates are made.
   */
  function filteredCodeHashAt(
    address registrant,
    uint256 index
  ) external returns (bytes32);

  /**
   * @notice Returns true if an address has registered
   */
  function isRegistered(address addr) external returns (bool);

  /**
   * @dev Convenience method to compute the code hash of an arbitrary contract
   */
  function codeHashOf(address addr) external returns (bytes32);
}

// File contracts/utils/UpdatableOperatorFilterer.sol

pragma solidity ^0.8.13;

/**
 * @title  UpdatableOperatorFilterer
 * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
 *         registrant's entries in the OperatorFilterRegistry. This contract allows the Owner to update the
 *         OperatorFilterRegistry address via updateOperatorFilterRegistryAddress, including to the zero address,
 *         which will bypass registry checks.
 *         Note that OpenSea will still disable creator earnings enforcement if filtered operators begin fulfilling orders
 *         on-chain, eg, if the registry is revoked or bypassed.
 * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:
 *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
 *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
 */
abstract contract UpdatableOperatorFilterer {
  /// @dev Emitted when an operator is not allowed.
  error OperatorNotAllowed(address operator);
  /// @dev Emitted when someone other than the owner is trying to call an only owner function.
  error OnlyOwner();

  event OperatorFilterRegistryAddressUpdated(address newRegistry);

  IOperatorFilterRegistry public operatorFilterRegistry;

  /// @dev The constructor that is called when the contract is being deployed.
  constructor(
    address _registry,
    address subscriptionOrRegistrantToCopy,
    bool subscribe
  ) {
    IOperatorFilterRegistry registry = IOperatorFilterRegistry(_registry);
    operatorFilterRegistry = registry;
    // If an inheriting token contract is deployed to a network without the registry deployed, the modifier
    // will not revert, but the contract will need to be registered with the registry once it is deployed in
    // order for the modifier to filter addresses.
    if (address(registry).code.length > 0) {
      if (subscribe) {
        registry.registerAndSubscribe(
          address(this),
          subscriptionOrRegistrantToCopy
        );
      } else {
        if (subscriptionOrRegistrantToCopy != address(0)) {
          registry.registerAndCopyEntries(
            address(this),
            subscriptionOrRegistrantToCopy
          );
        } else {
          registry.register(address(this));
        }
      }
    }
  }

  /**
   * @dev A helper function to check if the operator is allowed.
   */
  modifier onlyAllowedOperator(address from) virtual {
    // Allow spending tokens from addresses with balance
    // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
    // from an EOA.
    if (from != msg.sender) {
      _checkFilterOperator(msg.sender);
    }
    _;
  }

  /**
   * @dev A helper function to check if the operator approval is allowed.
   */
  modifier onlyAllowedOperatorApproval(address operator) virtual {
    _checkFilterOperator(operator);
    _;
  }

  /**
   * @notice Update the address that the contract will make OperatorFilter checks against. When set to the zero
   *         address, checks will be bypassed. OnlyOwner.
   */
  function updateOperatorFilterRegistryAddress(
    address newRegistry
  ) public virtual {
    if (msg.sender != owner()) {
      revert OnlyOwner();
    }
    operatorFilterRegistry = IOperatorFilterRegistry(newRegistry);
    emit OperatorFilterRegistryAddressUpdated(newRegistry);
  }

  /**
   * @dev Assume the contract has an owner, but leave specific Ownable implementation up to inheriting contract.
   */
  function owner() public view virtual returns (address);

  /**
   * @dev A helper function to check if the operator is allowed.
   */
  function _checkFilterOperator(address operator) internal view virtual {
    IOperatorFilterRegistry registry = operatorFilterRegistry;
    // Check registry code length to facilitate testing in environments without a deployed registry.
    if (address(registry) != address(0) && address(registry).code.length > 0) {
      // under normal circumstances, this function will revert rather than return false, but inheriting contracts
      // may specify their own OperatorFilterRegistry implementations, which may behave differently
      if (!registry.isOperatorAllowed(address(this), operator)) {
        revert OperatorNotAllowed(operator);
      }
    }
  }
}

// File contracts/utils/RevokableOperatorFilterer.sol

pragma solidity ^0.8.13;

/**
 * @title  RevokableOperatorFilterer
 * @notice This contract is meant to allow contracts to permanently skip OperatorFilterRegistry checks if desired. The
 *         Registry itself has an "unregister" function, but if the contract is ownable, the owner can re-register at
 *         any point. As implemented, this abstract contract allows the contract owner to permanently skip the
 *         OperatorFilterRegistry checks by calling revokeOperatorFilterRegistry. Once done, the registry
 *         address cannot be further updated.
 *         Note that OpenSea will still disable creator earnings enforcement if filtered operators begin fulfilling orders
 *         on-chain, eg, if the registry is revoked or bypassed.
 */
abstract contract RevokableOperatorFilterer is UpdatableOperatorFilterer {
  /// @dev Emitted when the registry has already been revoked.
  error RegistryHasBeenRevoked();
  /// @dev Emitted when the initial registry address is attempted to be set to the zero address.
  error InitialRegistryAddressCannotBeZeroAddress();

  event OperatorFilterRegistryRevoked();

  bool public isOperatorFilterRegistryRevoked;

  /// @dev The constructor that is called when the contract is being deployed.
  constructor(
    address _registry,
    address subscriptionOrRegistrantToCopy,
    bool subscribe
  )
    UpdatableOperatorFilterer(
      _registry,
      subscriptionOrRegistrantToCopy,
      subscribe
    )
  {
    // don't allow creating a contract with a permanently revoked registry
    if (_registry == address(0)) {
      revert InitialRegistryAddressCannotBeZeroAddress();
    }
  }

  /**
   * @notice Update the address that the contract will make OperatorFilter checks against. When set to the zero
   *         address, checks will be permanently bypassed, and the address cannot be updated again. OnlyOwner.
   */
  function updateOperatorFilterRegistryAddress(
    address newRegistry
  ) public override {
    if (msg.sender != owner()) {
      revert OnlyOwner();
    }
    // if registry has been revoked, do not allow further updates
    if (isOperatorFilterRegistryRevoked) {
      revert RegistryHasBeenRevoked();
    }

    operatorFilterRegistry = IOperatorFilterRegistry(newRegistry);
    emit OperatorFilterRegistryAddressUpdated(newRegistry);
  }

  /**
   * @notice Revoke the OperatorFilterRegistry address, permanently bypassing checks. OnlyOwner.
   */
  function revokeOperatorFilterRegistry() public {
    if (msg.sender != owner()) {
      revert OnlyOwner();
    }
    // if registry has been revoked, do not allow further updates
    if (isOperatorFilterRegistryRevoked) {
      revert RegistryHasBeenRevoked();
    }

    // set to zero address to bypass checks
    operatorFilterRegistry = IOperatorFilterRegistry(address(0));
    isOperatorFilterRegistryRevoked = true;
    emit OperatorFilterRegistryRevoked();
  }
}

// File contracts/utils/RevokableDefaultOperatorFilterer.sol

pragma solidity ^0.8.13;

/**
 * @title  RevokableDefaultOperatorFilterer
 * @notice Inherits from RevokableOperatorFilterer and automatically subscribes to the default OpenSea subscription.
 *         Note that OpenSea will disable creator earnings enforcement if filtered operators begin fulfilling orders
 *         on-chain, eg, if the registry is revoked or bypassed.
 */

abstract contract RevokableDefaultOperatorFilterer is
  RevokableOperatorFilterer
{
  /// @dev The constructor that is called when the contract is being deployed.
  constructor()
    RevokableOperatorFilterer(
      CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS,
      CANONICAL_CORI_SUBSCRIPTION,
      true
    )
  {}
}

// File contracts/Andrew_Mitchell_Decal.sol

pragma solidity ^0.8.17;

/// @author @0x__jj, @llio (Deca)
contract Andrew_Mitchell_Decal is
  ERC721,
  ReentrancyGuard,
  AccessControl,
  RevokableDefaultOperatorFilterer,
  Ownable
{
  using Address for address;
  using Strings for *;

  event ArtistMinted(uint256 numberOfTokens, uint256 remainingArtistSupply);

  mapping(address => bool) public minted;

  uint256 public totalSupply = 0;

  uint256 public constant MAX_SUPPLY = 100;

  bytes32 public merkleRoot;

  uint256 public artistMaxSupply;

  uint256 public artistSupply;

  address public artist;

  string public baseUri;

  constructor(
    string memory _baseUri,
    address[] memory _admins,
    uint256 _artistMaxSupply,
    address _artist
  ) ERC721("Decal by Andrew Mitchell", "DECAL") {
    if (_artistMaxSupply > MAX_SUPPLY) revert MaxSupplyReached();
    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    for (uint256 i = 0; i < _admins.length; i++) {
      _grantRole(DEFAULT_ADMIN_ROLE, _admins[i]);
    }
    baseUri = _baseUri;
    artistMaxSupply = _artistMaxSupply;
    artist = _artist;
  }

  function setArtist(address _artist) external onlyRole(DEFAULT_ADMIN_ROLE) {
    artist = _artist;
  }

  function setArtistMaxSupply(
    uint256 _artistMaxSupply
  ) external onlyRole(DEFAULT_ADMIN_ROLE) {
    if ((_artistMaxSupply - artistSupply) > (MAX_SUPPLY - totalSupply))
      revert MaxArtistSupplyReached();
    artistMaxSupply = _artistMaxSupply;
  }

  function setMerkleRoot(
    bytes32 _merkleRoot
  ) external onlyRole(DEFAULT_ADMIN_ROLE) {
    merkleRoot = _merkleRoot;
  }

  function setBaseUri(
    string memory _newBaseUri
  ) external onlyRole(DEFAULT_ADMIN_ROLE) {
    baseUri = _newBaseUri;
  }

  function mint(
    bytes32[] calldata _merkleProof
  ) external nonReentrant returns (uint256 tokenId) {
    if (minted[msg.sender]) revert AlreadyMinted();
    if (totalSupply >= MAX_SUPPLY) revert MaxSupplyReached();
    if (publicSupplyRemaining() < 1) revert MaxPublicSupplyReached();
    if (msg.sender.isContract()) revert CannotMintFromContract();
    bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
    if (!MerkleProof.verify(_merkleProof, merkleRoot, leaf))
      revert NotOnAllowlist();
    minted[msg.sender] = true;
    tokenId = totalSupply;
    totalSupply++;
    _safeMint(msg.sender, tokenId);
  }

  function artistMintForAdmin(
    uint256 _numberOfTokens
  ) external nonReentrant onlyRole(DEFAULT_ADMIN_ROLE) {
    if (_numberOfTokens == 0) revert CannotMintZero();
    if (artist == address(0)) revert NoArtist();
    uint256 remaining = artistMaxSupply - artistSupply;
    if (remaining == 0) revert MaxArtistSupplyReached();
    _numberOfTokens = uint256(Math.min(_numberOfTokens, remaining));
    uint256 tokenId = totalSupply;
    for (uint256 i = 0; i < _numberOfTokens; i++) {
      _safeMint(artist, tokenId);
      tokenId++;
    }
    artistSupply += _numberOfTokens;
    totalSupply = tokenId;
    emit ArtistMinted(_numberOfTokens, remaining);
  }

  function artistMint(uint256 _numberOfTokens) external nonReentrant {
    if (_numberOfTokens == 0) revert CannotMintZero();
    if (artist == address(0)) revert NoArtist();
    if (msg.sender != artist) revert NotArtist();
    uint256 remaining = artistMaxSupply - artistSupply;
    if (remaining == 0) revert MaxArtistSupplyReached();
    _numberOfTokens = uint256(Math.min(_numberOfTokens, remaining));
    uint256 tokenId = totalSupply;
    for (uint256 i = 0; i < _numberOfTokens; i++) {
      _safeMint(msg.sender, tokenId);
      tokenId++;
    }
    artistSupply += _numberOfTokens;
    totalSupply = tokenId;
    emit ArtistMinted(_numberOfTokens, remaining);
  }

  function publicSupplyRemaining() public view returns (uint256) {
    return MAX_SUPPLY - totalSupply - (artistMaxSupply - artistSupply);
  }

  function artistSupplyRemaining() external view returns (uint256) {
    return artistMaxSupply - artistSupply;
  }

  function tokenURI(
    uint256 _tokenId
  ) public view override(ERC721) returns (string memory) {
    require(_exists(_tokenId), "DECAL: URI query for nonexistent token");
    string memory baseURI = _baseURI();
    require(bytes(baseURI).length > 0, "baseURI not set");
    return string(abi.encodePacked(baseURI, _tokenId.toString()));
  }

  function getTokensOfOwner(
    address owner_
  ) external view returns (uint256[] memory) {
    uint256 tokenCount = balanceOf(owner_);
    uint256[] memory tokenIds = new uint256[](tokenCount);
    uint256 seen = 0;
    for (uint256 i = 0; i < totalSupply; i++) {
      if (ownerOf(i) == owner_) {
        tokenIds[seen] = i;
        seen++;
      }
      if (seen == tokenCount) break;
    }
    return tokenIds;
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override(ERC721, AccessControl) returns (bool) {
    return super.supportsInterface(interfaceId);
  }

  function _baseURI() internal view override(ERC721) returns (string memory) {
    return baseUri;
  }

  function setApprovalForAll(
    address operator,
    bool approved
  ) public override onlyAllowedOperatorApproval(operator) {
    super.setApprovalForAll(operator, approved);
  }

  function approve(
    address operator,
    uint256 tokenId
  ) public override onlyAllowedOperatorApproval(operator) {
    super.approve(operator, tokenId);
  }

  function transferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public override onlyAllowedOperator(from) {
    super.transferFrom(from, to, tokenId);
  }

  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public override onlyAllowedOperator(from) {
    super.safeTransferFrom(from, to, tokenId);
  }

  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes memory data
  ) public override onlyAllowedOperator(from) {
    super.safeTransferFrom(from, to, tokenId, data);
  }

  function owner()
    public
    view
    virtual
    override(Ownable, UpdatableOperatorFilterer)
    returns (address)
  {
    return Ownable.owner();
  }
}

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000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000f1da6e2d387e9da611dac8a7fc587eaa4b010013000000000000000000000000000000000000000000000000000000000000003268747470733a2f2f636c69656e742d6170692e646563612e73797374656d732f646563616c2f6d657461646174612f32312f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000a57ec3a618b6969a6b1fec2ef4bf54b2afc5ca300000000000000000000000000f9acf892c809d27d9cd14059aada68b343d0412

-----Decoded View---------------
Arg [0] : _baseUri (string): https://client-api.deca.systems/decal/metadata/21/
Arg [1] : _admins (address[]): 0xA57ec3a618b6969a6B1fEc2eF4BF54B2AfC5ca30,0x0F9acF892C809d27d9CD14059aADa68B343d0412
Arg [2] : _artistMaxSupply (uint256): 10
Arg [3] : _artist (address): 0xF1Da6E2d387e9DA611dAc8a7FC587Eaa4B010013

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [3] : 000000000000000000000000f1da6e2d387e9da611dac8a7fc587eaa4b010013
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000032
Arg [5] : 68747470733a2f2f636c69656e742d6170692e646563612e73797374656d732f
Arg [6] : 646563616c2f6d657461646174612f32312f0000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [8] : 000000000000000000000000a57ec3a618b6969a6b1fec2ef4bf54b2afc5ca30
Arg [9] : 0000000000000000000000000f9acf892c809d27d9cd14059aada68b343d0412

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