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// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "./interfaces/IUptownPanda.sol";
import "./interfaces/IUniswapV2Helper.sol";
import "./UptownPandaTwapable.sol";
import "./UptownPandaBurnable.sol";

contract UptownPanda is ERC20, AccessControl, Pausable, UptownPandaTwapable, UptownPandaBurnable, IUptownPanda {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    address public override uniswapPair;
    address public uniswapRouter;

    address public upFarm;
    address public upEthFarm;
    address public wethFarm;
    address public wbtcFarm;

    address public immutable uniswapV2HelperAddress;
    IUniswapV2Helper private immutable uniswapV2Helper;

    constructor(address _uniswapV2HelperAddress) public ERC20("Uptown Panda", "$UP") {
        uniswapV2HelperAddress = _uniswapV2HelperAddress;
        uniswapV2Helper = IUniswapV2Helper(_uniswapV2HelperAddress);
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
        _pause();
    }

    modifier senderIsMinter() {
        require(hasRole(MINTER_ROLE, _msgSender()), "Sender does not have minter role.");
        _;
    }

    modifier originIsAdmin() {
        require(hasRole(DEFAULT_ADMIN_ROLE, tx.origin), "Original sender does not have admin role.");
        _;
    }

    modifier minterSet() {
        require(getRoleMemberCount(MINTER_ROLE) == 1, "Minter is not set.");
        _;
    }

    modifier notInitialized() {
        require(!isInitialized(), "Contract has already been initialized.");
        _;
    }

    modifier allowTokenTransfer(address from) {
        address minter = getMinter();
        bool isMsgSenderMinter = _msgSender() == minter; // this is needed for minting tokens to investors while tokens are locked
        bool isFromMinter = from == minter; // this is needed for liquidity pool transfer while tokens are locked
        require(!paused() || isMsgSenderMinter || isFromMinter, "Token transfer not allowed.");
        _;
    }

    function revokeRole(bytes32 role, address account) public virtual override {
        require(false, "No revoking allowed, bro!");
        super.revokeRole(role, account); // this is never reached, it's here to get rid of annoying warnings
    }

    function renounceRole(bytes32 role, address account) public virtual override {
        require(false, "No renouncing allowed, bro!");
        super.renounceRole(role, account); // this is never reached, it's here to get rid of annoying warnings
    }

    function grantRole(bytes32 role, address account) public virtual override {
        require(false, "No granting allowed, bro!");
        super.grantRole(role, account); // this is never reached, it's here to get rid of annoying warnings
    }

    function isInitialized() public view override returns (bool) {
        bool isMinterSet = getRoleMemberCount(MINTER_ROLE) == 1;
        bool isUniswapPairSet = uniswapPair != address(0);
        bool isUniswapRouterSet = uniswapRouter != address(0);
        bool isUpFarmSet = upFarm != address(0);
        bool isUpEthFarmSet = upEthFarm != address(0);
        bool isWethFarmSet = wethFarm != address(0);
        bool isWbtcFarmSet = wbtcFarm != address(0);
        return
            isMinterSet &&
            isUniswapPairSet &&
            isUniswapRouterSet &&
            isUpFarmSet &&
            isUpEthFarmSet &&
            isWethFarmSet &&
            isWbtcFarmSet;
    }

    function initialize(
        address _minter,
        address _weth,
        address _upFarm,
        address _upEthFarm,
        address _wethFarm,
        address _wbtcFarm
    ) external override originIsAdmin notInitialized {
        _setupRole(MINTER_ROLE, _minter);
        _setupUniswap(_weth);
        _setupFarms(_upFarm, _upEthFarm, _wethFarm, _wbtcFarm);
    }

    function getMinter() public view override minterSet returns (address) {
        return getRoleMember(MINTER_ROLE, 0);
    }

    function getListingPriceMultiplier() external view override returns (uint256) {
        return LISTING_PRICE_MULTIPLIER;
    }

    function mint(address _account, uint256 _amount) external override senderIsMinter {
        _mint(_account, _amount);
    }

    function unlock() external override originIsAdmin {
        _unpause();
        _setListingTwap();
        _setDefaultBuyTimestamp();
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override {
        uint256[] memory amountsToBurn = _getAmountsToBurn(sender, recipient, amount);
        for (uint256 i = 0; i < amountsToBurn.length; i++) {
            _burn(sender, amountsToBurn[i]);
            amount = amount.sub(amountsToBurn[i]);
        }
        _logBuy(recipient, amount);
        super._transfer(sender, recipient, amount);
    }

    function _getNonBurnableSenders() internal view virtual override returns (address[] memory nonBurnableSenders) {
        nonBurnableSenders = new address[](7);
        nonBurnableSenders[0] = getMinter();
        nonBurnableSenders[1] = uniswapPair;
        nonBurnableSenders[2] = uniswapRouter;
        nonBurnableSenders[3] = upFarm;
        nonBurnableSenders[4] = upEthFarm;
        nonBurnableSenders[5] = wethFarm;
        nonBurnableSenders[6] = wbtcFarm;
    }

    function _getNonBurnableRecipients()
        internal
        view
        virtual
        override
        returns (address[] memory nonBurnableRecipients)
    {
        nonBurnableRecipients = new address[](4);
        nonBurnableRecipients[0] = upFarm;
        nonBurnableRecipients[1] = upEthFarm;
        nonBurnableRecipients[2] = wethFarm;
        nonBurnableRecipients[3] = wbtcFarm;
    }

    function _getNonLoggableRecipients()
        internal
        view
        virtual
        override
        returns (address[] memory nonLoggableRecipients)
    {
        nonLoggableRecipients = new address[](5);
        nonLoggableRecipients[0] = uniswapPair;
        nonLoggableRecipients[1] = upFarm;
        nonLoggableRecipients[2] = upEthFarm;
        nonLoggableRecipients[3] = wethFarm;
        nonLoggableRecipients[4] = wbtcFarm;
    }

    function _isWalletToWalletTransfer(address _sender, address _recipient)
        internal
        view
        virtual
        override
        returns (bool isWalletToWalletTransfer)
    {
        isWalletToWalletTransfer = _sender != uniswapRouter && _recipient != uniswapPair;
    }

    function _getListingPriceForBurnCalculation() internal view virtual override returns (uint256 listingPrice) {
        return _getListingPrice();
    }

    function _getTwapPriceForBurnCalculation() internal virtual override returns (uint256 twapPrice) {
        _updateTwap();
        return currentTwap;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override allowTokenTransfer(from) {
        super._beforeTokenTransfer(from, to, amount);
    }

    function _setupUniswap(address _weth) private {
        (address token0, address token1) = uniswapV2Helper.sortTokens(address(this), _weth);
        uniswapPair = uniswapV2Helper.pairFor(token0, token1);
        uniswapRouter = uniswapV2Helper.getRouterAddress();

        bool isUptownPandaToken0 = token0 == address(this);
        address oracle = uniswapV2Helper.getUniswapV2OracleAddress();
        _initializeTwap(isUptownPandaToken0, uniswapPair, oracle);
    }

    function _setupFarms(
        address _upFarm,
        address _upEthFarm,
        address _wethFarm,
        address _wbtcFarm
    ) private {
        upFarm = _upFarm;
        upEthFarm = _upEthFarm;
        wethFarm = _wethFarm;
        wbtcFarm = _wbtcFarm;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@openzeppelin/contracts/math/SafeMath.sol";

contract UptownPandaBurnable {
    event BuyLogAdded(address indexed buyer, uint256 indexed timestamp, uint256 amount);
    event BurnAmountCalculated(
        address indexed sender,
        address indexed recipient,
        uint256 indexed buyTimestamp,
        uint256 buyAmount,
        uint256 burnAmount
    );

    using SafeMath for uint256;

    uint256 private constant BURN_PERCENT_SCALE = 1e9;
    uint256 public constant MAX_BURN_PRICE_MULTIPLIER = 3;
    uint256 public constant MIN_BURN_PRICE_MULTIPLIER = 10;
    uint256 public constant MAX_BURN_PERCENT = 30;
    uint256 public constant MIN_BURN_PERCENT = 5;
    uint256 public constant WALLET_TO_WALLET_BURN_PERCENT = 5;
    uint256 public constant SELL_PENALTY_INTERVAL = 5 minutes;

    struct BuyLog {
        uint256 amount;
        uint256 timestamp;
    }

    uint256 private defaultBuyTimestamp;
    mapping(address => BuyLog[]) private buyLogs;
    mapping(address => uint256) private buyLogTracker;

    function _getAmountsToBurn(
        address _sender,
        address _recipient,
        uint256 _amount
    ) internal returns (uint256[] memory) {
        return
            _shouldBurnTokens(_sender, _recipient, _amount)
                ? _calculateAmountsToBurn(_sender, _recipient, _amount)
                : new uint256[](0);
    }

    function _shouldBurnTokens(address _sender, address _recipient, uint256 _amount) private view returns (bool) {
        if (_amount == 0) {
            return false;
        }

        address[] memory nonBurnableSenders = _getNonBurnableSenders();
        for (uint256 i = 0; i < nonBurnableSenders.length; i++) {
            if (_sender == nonBurnableSenders[i]) {
                return false;
            }
        }

        address[] memory nonBurnableRecipients = _getNonBurnableRecipients();
        for (uint256 i = 0; i < nonBurnableRecipients.length; i++) {
            if (_recipient == nonBurnableRecipients[i]) {
                return false;
            }
        }

        return true;
    }

    function _calculateAmountsToBurn(
        address _sender,
        address _recipient,
        uint256 _amount
    ) private returns (uint256[] memory) {
        BuyLog[] memory burnParts = _getBurnParts(_sender, _amount);

        uint256[] memory amountsToBurn = new uint256[](burnParts.length);
        for (uint256 i = 0; i < burnParts.length; i++) {
            amountsToBurn[i] = _calculateSingleAmountToBurn(
                _sender,
                _recipient,
                burnParts[i].amount,
                burnParts[i].timestamp
            );
            emit BurnAmountCalculated(
                _sender,
                _recipient,
                burnParts[i].timestamp,
                burnParts[i].amount,
                amountsToBurn[i]
            );
        }
        return amountsToBurn;
    }

    function _getBurnParts(address _sender, uint256 _amount) private returns (BuyLog[] memory) {
        uint256 burnsCount = _getBurnsCount(_sender, _amount);

        uint256 startBuyLogIndex = buyLogTracker[_sender];
        BuyLog[] storage buyLog = buyLogs[_sender];

        BuyLog[] memory burnParts = new BuyLog[](burnsCount);
        uint256 amountLeft = _amount;

        for (uint256 i = 0; i < burnsCount; i++) {
            uint256 currentBuyLogIndex = startBuyLogIndex + i;
            if (currentBuyLogIndex >= buyLog.length) {
                burnParts[burnsCount - 1] = BuyLog(amountLeft, defaultBuyTimestamp);
                break;
            }
            uint256 subtractAmount = amountLeft >= buyLog[currentBuyLogIndex].amount
                ? buyLog[currentBuyLogIndex].amount
                : amountLeft;

            burnParts[i] = BuyLog(subtractAmount, buyLog[currentBuyLogIndex].timestamp);

            amountLeft = amountLeft.sub(subtractAmount);
            buyLog[currentBuyLogIndex].amount = buyLog[currentBuyLogIndex].amount.sub(subtractAmount);

            if (buyLog[currentBuyLogIndex].amount == 0) {
                buyLogTracker[_sender] = buyLogTracker[_sender].add(1);
            }
        }

        return burnParts;
    }

    function _getBurnsCount(address _sender, uint256 _amount) private view returns (uint256) {
        BuyLog[] storage buyLog = buyLogs[_sender];
        uint256 burnsCount = 0;
        uint256 amountLeft = _amount;

        for (uint256 buyLogIndex = buyLogTracker[_sender]; buyLogIndex < buyLog.length; buyLogIndex++) {
            if (amountLeft == 0) {
                break;
            }
            amountLeft = buyLog[buyLogIndex].amount > amountLeft ? 0 : amountLeft.sub(buyLog[buyLogIndex].amount);
            burnsCount++;
        }

        return amountLeft > 0 ? burnsCount.add(1) : burnsCount;
    }

    function _calculateSingleAmountToBurn(
        address _sender,
        address _recipient,
        uint256 _amount,
        uint256 _timestamp
    ) private returns (uint256) {
        // check for sell under 5 minutes
        bool shouldBurnMaxAmount = block.timestamp.sub(_timestamp) < SELL_PENALTY_INTERVAL;
        if (shouldBurnMaxAmount) {
            return _amount.mul(MAX_BURN_PERCENT).div(100);
        }

        // check if wallet to wallet transfer
        if (_isWalletToWalletTransfer(_sender, _recipient)) {
            return _amount.mul(WALLET_TO_WALLET_BURN_PERCENT).div(100);
        }

        // burn by twap
        uint256 listingPrice = _getListingPriceForBurnCalculation();
        uint256 twapPrice = _getTwapPriceForBurnCalculation();
        uint256 currentPriceMultiplierScaled = listingPrice.mul(BURN_PERCENT_SCALE).div(twapPrice);

        if (currentPriceMultiplierScaled <= MAX_BURN_PRICE_MULTIPLIER.mul(BURN_PERCENT_SCALE)) {
            return _amount.mul(MAX_BURN_PERCENT).div(100);
        }

        if (currentPriceMultiplierScaled >= MIN_BURN_PRICE_MULTIPLIER.mul(BURN_PERCENT_SCALE)) {
            return _amount.mul(MIN_BURN_PERCENT).div(100);
        }

        uint256 maxBurnPercentScaled = MAX_BURN_PERCENT.mul(BURN_PERCENT_SCALE);
        uint256 burnPercentDiff = MAX_BURN_PERCENT.sub(MIN_BURN_PERCENT);
        uint256 burnPercentDiffDividendScaled = currentPriceMultiplierScaled.sub(
            MAX_BURN_PRICE_MULTIPLIER.mul(BURN_PERCENT_SCALE)
        );
        uint256 burnPercentDiffDivisor = MIN_BURN_PRICE_MULTIPLIER.sub(MAX_BURN_PRICE_MULTIPLIER);
        uint256 burnPercentScaled = maxBurnPercentScaled.sub(
            burnPercentDiff.mul(burnPercentDiffDividendScaled.div(burnPercentDiffDivisor))
        );
        return _amount.mul(burnPercentScaled).div(BURN_PERCENT_SCALE.mul(100));
    }

    function _setDefaultBuyTimestamp() internal {
        defaultBuyTimestamp = block.timestamp;
    }

    function _logBuy(address _recipient, uint256 _amount) internal {
        address[] memory nonLoggableRecipients = _getNonLoggableRecipients();
        for (uint256 i = 0; i < nonLoggableRecipients.length; i++) {
            if (_recipient == nonLoggableRecipients[i]) {
                return;
            }
        }
        BuyLog[] storage recipientBuyLog = buyLogs[_recipient];
        recipientBuyLog.push(BuyLog(_amount, block.timestamp));
        emit BuyLogAdded(_recipient, block.timestamp, _amount);
    }

    function _getNonBurnableSenders() internal view virtual returns (address[] memory nonBurnableSenders) {}

    function _getNonBurnableRecipients() internal view virtual returns (address[] memory nonBurnableRecipients) {}

    function _getNonLoggableRecipients() internal view virtual returns (address[] memory nonLoggableRecipients) {}

    function _isWalletToWalletTransfer(address _sender, address _recipient)
        internal
        view
        virtual
        returns (bool isWalletToWalletTransfer)
    {}

    function _getListingPriceForBurnCalculation() internal view virtual returns (uint256 listingPrice) {}

    function _getTwapPriceForBurnCalculation() internal virtual returns (uint256 twapPrice) {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@uniswap/lib/contracts/libraries/FixedPoint.sol";
import "./interfaces/IUniswapV2Oracle.sol";

contract UptownPandaTwapable {
    using FixedPoint for *;

    event TwapUpdated(uint256 newTwap, uint256 priceCumulative, uint32 blockTimestamp);

    uint256 public constant LISTING_PRICE_MULTIPLIER = 11;
    uint256 public constant TWAP_CALCULATION_INTERVAL = 10 minutes;

    bool private isListingTwapSet;
    bool private isInitialized;
    bool private isTokenToken0; // is our token first after sorting
    address private uniswapPair;
    IUniswapV2Oracle private oracle;

    uint32 public currentTwapTimestamp;
    uint256 public currentTwapPriceCumulative;
    uint256 public currentTwap;

    constructor() public {
        isListingTwapSet = false;
        isInitialized = false;
    }

    modifier initialized() {
        require(isInitialized, "TWAP data required for calculation has not been set yet.");
        _;
    }

    modifier listingTwapSet() {
        require(isListingTwapSet, "Listing TWAP has not been set yet.");
        _;
    }

    function _initializeTwap(
        bool _isTokenToken0,
        address _uniswapPair,
        address _oracle
    ) internal {
        isTokenToken0 = _isTokenToken0;
        uniswapPair = _uniswapPair;
        oracle = IUniswapV2Oracle(_oracle);
        isInitialized = true;
    }

    function _setListingTwap() internal {
        if (isListingTwapSet) {
            return;
        }
        (uint256 priceCumulative, uint32 timestamp) = _currentCumulativePrices();
        _setTwapValuesAndTriggerUpdateEvent(_getListingPrice(), priceCumulative, timestamp);
        isListingTwapSet = true;
    }

    function _updateTwap() internal initialized listingTwapSet {
        (uint256 priceCumulative, uint32 timestamp) = _currentCumulativePrices();

        uint32 timeElapsed = timestamp - currentTwapTimestamp;
        if (timeElapsed < TWAP_CALCULATION_INTERVAL) {
            return;
        }

        // cumulative price is in (uq112x112 price * seconds) units so we simply wrap it after division by time elapsed
        FixedPoint.uq112x112 memory newTwapAsFixedPoint = FixedPoint.uq112x112(
            uint224((priceCumulative - currentTwapPriceCumulative) / timeElapsed)
        );
        uint144 newTwap = newTwapAsFixedPoint.mul(1 ether).decode144();
        _setTwapValuesAndTriggerUpdateEvent(newTwap, priceCumulative, timestamp);
    }

    function _setTwapValuesAndTriggerUpdateEvent(
        uint256 _currentTwap,
        uint256 _currentTwapPriceCumulative,
        uint32 _currentTwapTimestamp
    ) private {
        currentTwap = _currentTwap;
        currentTwapPriceCumulative = _currentTwapPriceCumulative;
        currentTwapTimestamp = _currentTwapTimestamp;
        emit TwapUpdated(currentTwap, currentTwapPriceCumulative, currentTwapTimestamp);
    }

    function _currentCumulativePrices() private view returns (uint256 priceCumulative, uint32 timestamp) {
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) = oracle.currentCumulativePrices(
            uniswapPair
        );
        priceCumulative = isTokenToken0 ? price1Cumulative : price0Cumulative;
        timestamp = blockTimestamp;
    }

    function _getListingPrice() internal pure returns (uint256) {
        return LISTING_PRICE_MULTIPLIER * 1 ether;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

interface IUniswapV2Helper {
    function sortTokens(address tokenA, address tokenB) external pure returns (address token0, address token1);

    function pairFor(address tokenA, address tokenB) external view returns (address pair);

    function getFactoryAddress() external view returns (address factory);

    function getRouterAddress() external view returns (address router);

    function getUniswapV2OracleAddress() external view returns (address oracle);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

interface IUniswapV2Oracle {
    function currentBlockTimestamp() external view returns (uint32);

    function currentCumulativePrices(address pair)
        external
        view
        returns (
            uint256 price0Cumulative,
            uint256 price1Cumulative,
            uint32 blockTimestamp
        );
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IUptownPanda is IERC20 {
    function mint(address _account, uint256 _amount) external;

    function isInitialized() external view returns (bool);

    function initialize(
        address _minter,
        address _weth,
        address _upFarm,
        address _upEthFarm,
        address _wethFarm,
        address _wbtcFarm
    ) external;

    function getMinter() external view returns (address);

    function unlock() external;

    function getListingPriceMultiplier() external view returns (uint256);

    function uniswapPair() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../utils/EnumerableSet.sol";
import "../utils/Address.sol";
import "../GSN/Context.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * 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 {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @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 {_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) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @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 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.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _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.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _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 granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        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.
     *
     * [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}.
     * ====
     */
    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 {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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 functionCall(target, data, "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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

pragma solidity >=0.4.0;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint _x;
    }

    uint8 private constant RESOLUTION = 112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 x) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(x) << RESOLUTION);
    }

    // encodes a uint144 as a UQ144x112
    function encode144(uint144 x) internal pure returns (uq144x112 memory) {
        return uq144x112(uint256(x) << RESOLUTION);
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
        require(x != 0, 'FixedPoint: DIV_BY_ZERO');
        return uq112x112(self._x / uint224(x));
    }

    // multiply a UQ112x112 by a uint, returning a UQ144x112
    // reverts on overflow
    function mul(uq112x112 memory self, uint y) internal pure returns (uq144x112 memory) {
        uint z;
        require(y == 0 || (z = uint(self._x) * y) / y == uint(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
        return uq144x112(z);
    }

    // returns a UQ112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
    }

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a UQ144x112 into a uint144 by truncating after the radix point
    function decode144(uq144x112 memory self) internal pure returns (uint144) {
        return uint144(self._x >> RESOLUTION);
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {
    "": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000005cdf8d8cbcff0ad458efed22a7451b69baa0e8b6

-----Decoded View---------------
Arg [0] : _uniswapV2HelperAddress (address): 0x5CdF8D8CbCFf0AD458efed22A7451b69bAa0e8B6

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000005cdf8d8cbcff0ad458efed22a7451b69baa0e8b6