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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "@chainlink/contracts/src/v0.8/interfaces/LinkTokenInterface.sol";
import "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";
import "@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol";

abstract contract NftContract {
  function mint(
    address to,
    uint256 tokenId,
    uint8 width,
    uint8 height
  ) external virtual;
}

contract WhitelistV1 is VRFConsumerBaseV2, Ownable {
  // Chainlink params
  VRFCoordinatorV2Interface public COORDINATOR;
  LinkTokenInterface public LINKTOKEN;
  uint256[] private randomSeedList;
  uint64 public subscriptionId;
  bytes32 public keyHash;
  uint256 public requestId;

  struct Whitelist {
    uint8 width;
    uint8 height;
    uint16 seedOffset;
    uint16 currentSupply;
    uint32 startTime;
    uint32 endTime;
    bytes32 merkleRoot;
  }

  mapping(uint256 => Whitelist) public whitelistList; // whitelistId to whitelist struct
  mapping(uint256 => uint16[]) private whitelistTokenList; // whitelistId to token id array
  mapping(uint256 => mapping(address => bool)) public minted; // [whitelistId][address] = false
  address immutable nftContractAddress; // nft contract

  event RandomWordsReceived(uint256 length);
  event WhitelistCreated(
    uint256 listId,
    uint32 startTime,
    uint32 endTime,
    uint8 width,
    uint8 height,
    bytes32 merkleRoot
  );
  event WhitelistUpdated(uint256 listId, uint32 startTime, uint32 endTime);
  event Mint(address to, uint256 tokenId, uint256 listId);

  constructor(
    address _nftContractAddress,
    uint64 _subscriptionId,
    address vrfCoordinator,
    address linkTokenAddress,
    bytes32 _keyHash
  ) VRFConsumerBaseV2(vrfCoordinator) {
    nftContractAddress = _nftContractAddress;
    subscriptionId = _subscriptionId;
    COORDINATOR = VRFCoordinatorV2Interface(vrfCoordinator);
    LINKTOKEN = LinkTokenInterface(linkTokenAddress);
    keyHash = _keyHash;
  }

  modifier isActive(uint256 listId) {
    Whitelist memory whitelist = whitelistList[listId];
    require(whitelist.startTime <= block.timestamp, "Session not started");
    require(whitelist.endTime >= block.timestamp, "Session ended");
    _;
  }

  function setKeyHash(bytes32 _keyHash) external onlyOwner {
    keyHash = _keyHash;
  }

  function generateRandomWords(uint32 numWords) external onlyOwner {
    uint256[] memory randomWords = new uint256[](numWords);
    uint256 random;
    for (uint32 i = 0; i < numWords; i++) {
      random = uint256(
        keccak256(abi.encodePacked(random, block.difficulty, block.timestamp))
      );
      randomWords[i] = random;
    }
    fulfillRandomWords(0, randomWords);
  }

  function requestRandomWords(uint32 numWords, uint32 callbackGasLimit)
    external
    onlyOwner
  {
    // Will revert if subscription is not set and funded.
    requestId = COORDINATOR.requestRandomWords(
      keyHash,
      subscriptionId,
      3, //requestConfirmations
      callbackGasLimit,
      numWords
    );
  }

  function createWhitelist(
    uint256 listId,
    uint8 width,
    uint8 height,
    uint16 seedOffset,
    uint32 startTime,
    uint32 endTime,
    bytes32 merkleRoot,
    uint16[] calldata tokenList
  ) external onlyOwner {
    require(
      tokenList.length <= randomSeedList.length * 16,
      "Insufficient random seeds"
    );
    require(whitelistList[listId].width == 0, "listId exists");
    require(width > 0 && height > 0, "Incorrect width or height");
    whitelistList[listId] = Whitelist(
      width,
      height,
      uint16(listId + seedOffset),
      0,
      startTime,
      endTime,
      merkleRoot
    );
    whitelistTokenList[listId] = tokenList;
    shuffleTokenList(listId);
    emit WhitelistCreated(
      listId,
      startTime,
      endTime,
      width,
      height,
      merkleRoot
    );
  }

  function updateWhitelistStartTime(uint256 listId, uint32 _startTime)
    external
    onlyOwner
  {
    whitelistList[listId].startTime = _startTime;
    emit WhitelistUpdated(
      listId,
      whitelistList[listId].startTime,
      whitelistList[listId].endTime
    );
  }

  function updateWhitelistEndTime(uint256 listId, uint32 _endTime)
    external
    onlyOwner
  {
    whitelistList[listId].endTime = _endTime;
    emit WhitelistUpdated(
      listId,
      whitelistList[listId].startTime,
      whitelistList[listId].endTime
    );
  }

  function mint(uint256 listId, bytes32[] calldata proof)
    external
    isActive(listId)
  {
    require(msg.sender == tx.origin, "Contract interaction not allowed");
    require(verifyProof(listId, msg.sender, proof), "Invalid merkle proof");

    require(!minted[listId][msg.sender], "Already minted");

    minted[listId][msg.sender] = true;
    uint256 tokenId = drawRandomTokenId(listId);
    NftContract nftContract = NftContract(nftContractAddress);
    Whitelist memory whitelist = whitelistList[listId];
    nftContract.mint(msg.sender, tokenId, whitelist.width, whitelist.height);
    emit Mint(msg.sender, tokenId, listId);
  }

  function getRandomSeedListLength() external view returns (uint256) {
    return randomSeedList.length * 16;
  }

  function verifyProof(
    uint256 listId,
    address who,
    bytes32[] calldata proof
  ) public view returns (bool) {
    bytes32 leaf = keccak256(abi.encodePacked(who));
    return MerkleProof.verify(proof, whitelistList[listId].merkleRoot, leaf);
  }

  function fulfillRandomWords(
    uint256,
    /* requestId */
    uint256[] memory randomWords
  ) internal override {
    for (uint256 i = 0; i < randomWords.length; i++) {
      randomSeedList.push(randomWords[i]);
    }
    emit RandomWordsReceived(randomWords.length);
  }

  function shuffleTokenList(uint256 listId) internal {
    uint16[] storage tokenList = whitelistTokenList[listId];
    for (uint16 i = 0; i < tokenList.length; i++) {
      uint256 seedIndex = ((i + whitelistList[listId].seedOffset) / 16) %
        randomSeedList.length;
      uint256 random = uint16(randomSeedList[seedIndex] >> (i % 16)) %
        tokenList.length;
      (tokenList[i], tokenList[random]) = (tokenList[random], tokenList[i]);
    }
  }

  function drawRandomTokenId(uint256 listId) internal returns (uint256) {
    whitelistList[listId].currentSupply += 1;
    return whitelistTokenList[listId][whitelistList[listId].currentSupply - 1];
  }
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
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 Returns the rebuilt hash obtained by traversing a Merklee 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++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  ) external returns (bool success);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool success);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address private immutable vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) {
    vrfCoordinator = _vrfCoordinator;
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}

// SPDX-License-Identifier: MIT
// 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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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VRFCoordinatorV2Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LINKTOKEN","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : _nftContractAddress (address): 0xCb4D18341753e6e7586dB91A59A3C494623d7f4C
Arg [1] : _subscriptionId (uint64): 48
Arg [2] : vrfCoordinator (address): 0x271682DEB8C4E0901D1a1550aD2e64D568E69909
Arg [3] : linkTokenAddress (address): 0x514910771AF9Ca656af840dff83E8264EcF986CA
Arg [4] : _keyHash (bytes32): 0x8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000cb4d18341753e6e7586db91a59a3c494623d7f4c
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000030
Arg [2] : 000000000000000000000000271682deb8c4e0901d1a1550ad2e64d568e69909
Arg [3] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [4] : 8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef