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// SPDX-License-Identifier: Unlicensed

pragma solidity ^0.6.2;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./uniswapv2/interfaces/IUniswapV2Factory.sol";
import "./uniswapv2/interfaces/IUniswapV2Router02.sol";
import "./uniswapv2/interfaces/IUniswapV2Pair.sol";
import "./uniswapv2/interfaces/IWETH.sol";

contract DRF is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

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

    mapping(address => bool) private _isReflectExcluded;
    address[] private _reflectExcluded;
    mapping(address => bool) private _isNoFee;
    mapping(address => bool) private _transferPairAddress;
    uint256 private constant MAX = uint256(- 1);
    uint256 private constant _tTotal = 10000000e18;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    enum TransferState {Normal, Buy, Sell}

    /// @notice Principal supply to generate rewards for LP or liquidity
    /// @dev The actual supply is in this contract
    uint256 public principalSupply;
    /// @notice Reserve supply used to generate liquidity
    /// @dev The actual supply is in lord contract
    uint256 public reserveSupply;
    /// @notice Bonus supply used as buy bonus
    /// @dev The actual supply is in lord contract
    uint256 public bonusSupply;

    uint256 public reflectFeeDenominator = 67;
    uint256 public buyTxFeeDenominator = 200;
    uint256 public sellTxFeeDenominator = 200;
    uint256 public buyBonusDenominator = 25;
    uint256 public sellFeeDenominator = 50;

    /// @dev Restrict buy max, set to 0 to remove restriction
    uint256 public restrictBuyAmount = 8000e18;

    address public lord;
    address public pairAddress;

    struct TValues {
        uint256 amount;
        uint256 transferAmount;
        uint256 fee;
        uint256 txFee;
        uint256 sellFee;
        uint256 buyBonus;
    }

    struct RValues {
        uint256 amount;
        uint256 transferAmount;
        uint256 fee;
        uint256 txFee;
        uint256 sellFee;
        uint256 buyBonus;
    }

    string private _name = 'drift.finance';
    string private _symbol = 'DRF';
    uint8 private _decimals = 18;

    constructor () public {
    }

    receive() external payable {
    }

    /* ========== Modifiers ========== */

    modifier onlyLord {
        require(_msgSender() == lord, "Lord only");
        _;
    }

    /* ========== Only Owner ========== */

    function init(address _lord, address _pairAddress) external onlyOwner {
        if (lord == address(0)) {
            lord = _lord;
            pairAddress = _pairAddress;

            _rOwned[lord] = _rTotal;
            setNoFee(lord, true);
            excludeReflectAccount(lord);
            excludeReflectAccount(pairAddress);

            // Set transfer pair address so contract know which one is buy or sell
            setTransferPairAddress(pairAddress, true);

            // Set no fee since we use this contract as principal to generate rewards for LP provider
            setNoFee(address(this), true);
        }
    }

    function setNoFee(address account, bool value) public onlyOwner {
        _isNoFee[account] = value;
    }

    function setTransferPairAddress(address transferPairAddress, bool value) public onlyOwner {
        _transferPairAddress[transferPairAddress] = value;
    }

    function setRestrictBuyAmount(uint256 amount) external onlyOwner {
        restrictBuyAmount = amount;
    }

    function excludeReflectAccount(address account) public onlyOwner {
        require(!_isReflectExcluded[account], "Already excluded");
        if (_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isReflectExcluded[account] = true;
        _reflectExcluded.push(account);
    }

    function includeReflectAccount(address account) public onlyOwner {
        require(_isReflectExcluded[account], "Already included");
        for (uint256 i = 0; i < _reflectExcluded.length; i++) {
            if (_reflectExcluded[i] == account) {
                _reflectExcluded[i] = _reflectExcluded[_reflectExcluded.length - 1];
                _tOwned[account] = 0;
                _isReflectExcluded[account] = false;
                _reflectExcluded.pop();
                break;
            }
        }
    }

    /* ========== Only Lord ========== */

    function setFee(
        uint256 _reflectFeeDenominator,
        uint256 _buyTxFeeDenominator,
        uint256 _sellTxFeeDenominator,
        uint256 _buyBonusDenominator,
        uint256 _sellFeeDenominator
    ) external onlyLord {
        reflectFeeDenominator = _reflectFeeDenominator;
        buyTxFeeDenominator = _buyTxFeeDenominator;
        sellTxFeeDenominator = _sellTxFeeDenominator;
        buyBonusDenominator = _buyBonusDenominator;
        sellFeeDenominator = _sellFeeDenominator;
    }

    function setReserveSupply(uint256 amount) external onlyLord {
        reserveSupply = amount;
    }

    /// @notice Deposit principal supply from lord
    function depositPrincipalSupply(uint256 amount) external onlyLord {
        principalSupply = amount;
        _transferFromExcluded(lord, address(this), principalSupply, false, TransferState.Normal);
    }

    /// @notice Withdraw back principal supply to lord
    function withdrawPrincipalSupply() external onlyLord returns(uint256) {
        _transferToExcluded(address(this), lord, balanceOf(address(this)), false, TransferState.Normal);
        return principalSupply;
    }

    /// @notice Reward LP providers if pair address is specified, otherwise just add the reward to reserve supply for liquidity
    function distributePrincipalRewards(address rewardPairAddress) external onlyLord {
        uint256 balance = balanceOf(address(this));
        if (balance > 0) {
            uint256 reward = balance.sub(principalSupply);
            // If pair address specified then reward LP provider
            if (rewardPairAddress != address(0)) {
                _transferToExcluded(address(this), rewardPairAddress, reward, false, TransferState.Normal);
                IUniswapV2Pair(rewardPairAddress).sync();
            }
            // else add as reserve supply to generate liquidity
            else {
                _transferToExcluded(address(this), lord, reward, false, TransferState.Normal);
                reserveSupply = reserveSupply.add(reward);
            }
        }
    }

    /* ========== View ========== */

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function circulatingSupply() public view returns (uint256) {
        return _tTotal.sub(balanceOf(address(this))).sub(balanceOf(lord));
    }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isReflectExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]);
    }

    function isExcluded(address account) public view returns (bool) {
        return _isReflectExcluded[account];
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }

    function reflectionFromToken(uint256 tAmount, bool deductTransferFee, TransferState transferState) public view returns (uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (RValues memory r,) = _getValues(tAmount, true, transferState);
            return r.amount;
        } else {
            (RValues memory r,) = _getValues(tAmount, true, transferState);
            return r.transferAmount;
        }
    }

    function tokenFromReflection(uint256 rAmount) public view returns (uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate = _getRate();
        return rAmount.div(currentRate);
    }

    /* ========== Mutative ========== */

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    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;
    }

    function reflect(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isReflectExcluded[sender], "Excluded addresses cannot call this function");
        (RValues memory r,) = _getValues(tAmount, !_isNoFee[sender], TransferState.Normal);
        _rOwned[sender] = _rOwned[sender].sub(r.amount);
        _rTotal = _rTotal.sub(r.amount);
        _tFeeTotal = _tFeeTotal.add(tAmount);
    }

    /* ========== Private ========== */

    function _approve(address owner, address spender, uint256 amount) private {
        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);
    }

    function _transfer(address sender, address recipient, uint256 amount) private {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Invalid amount");

        bool hasFee = !_isNoFee[sender] && !_isNoFee[recipient];
        TransferState transferState;
        if (_transferPairAddress[sender]) {
            transferState = TransferState.Buy;
        } else if (_transferPairAddress[recipient]) {
            transferState = TransferState.Sell;
        }
        if (restrictBuyAmount > 0 && transferState == TransferState.Buy && hasFee) {
            require(amount <= restrictBuyAmount, "Buy restricted");
        }
        if (_isReflectExcluded[sender] && !_isReflectExcluded[recipient]) {
            _transferFromExcluded(sender, recipient, amount, hasFee, transferState);
        } else if (!_isReflectExcluded[sender] && _isReflectExcluded[recipient]) {
            _transferToExcluded(sender, recipient, amount, hasFee, transferState);
        } else if (!_isReflectExcluded[sender] && !_isReflectExcluded[recipient]) {
            _transferStandard(sender, recipient, amount, hasFee, transferState);
        } else if (_isReflectExcluded[sender] && _isReflectExcluded[recipient]) {
            _transferBothExcluded(sender, recipient, amount, hasFee, transferState);
        } else {
            _transferStandard(sender, recipient, amount, hasFee, transferState);
        }
    }

    function _transferStandard(address sender, address recipient, uint256 tAmount, bool hasFee, TransferState transferState) private {
        (RValues memory r, TValues memory t) = _getValues(tAmount, hasFee, transferState);
        _rOwned[sender] = _rOwned[sender].sub(r.amount);
        _rOwned[recipient] = _rOwned[recipient].add(r.transferAmount.add(r.buyBonus));

        _tOwned[lord] = _tOwned[lord].add(t.txFee.add(t.sellFee)).sub(t.buyBonus);
        _rOwned[lord] = _rOwned[lord].add(r.txFee.add(r.sellFee)).sub(r.buyBonus);
        reserveSupply = reserveSupply.add(t.txFee);
        bonusSupply = bonusSupply.add(t.sellFee).sub(t.buyBonus);

        _reflectFee(r.fee, t.fee);
        emit Transfer(sender, recipient, t.transferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount, bool hasFee, TransferState transferState) private {
        (RValues memory r, TValues memory t) = _getValues(tAmount, hasFee, transferState);
        _rOwned[sender] = _rOwned[sender].sub(r.amount);
        _tOwned[recipient] = _tOwned[recipient].add(t.transferAmount.add(t.buyBonus));
        _rOwned[recipient] = _rOwned[recipient].add(r.transferAmount.add(r.buyBonus));

        _tOwned[lord] = _tOwned[lord].add(t.txFee.add(t.sellFee)).sub(t.buyBonus);
        _rOwned[lord] = _rOwned[lord].add(r.txFee.add(r.sellFee)).sub(r.buyBonus);
        reserveSupply = reserveSupply.add(t.txFee);
        bonusSupply = bonusSupply.add(t.sellFee).sub(t.buyBonus);

        _reflectFee(r.fee, t.fee);
        emit Transfer(sender, recipient, t.transferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount, bool hasFee, TransferState transferState) private {
        (RValues memory r, TValues memory t) = _getValues(tAmount, hasFee, transferState);
        _tOwned[sender] = _tOwned[sender].sub(t.amount);
        _rOwned[sender] = _rOwned[sender].sub(r.amount);
        _rOwned[recipient] = _rOwned[recipient].add(r.transferAmount.add(r.buyBonus));

        _tOwned[lord] = _tOwned[lord].add(t.txFee.add(t.sellFee)).sub(t.buyBonus);
        _rOwned[lord] = _rOwned[lord].add(r.txFee.add(r.sellFee)).sub(r.buyBonus);
        reserveSupply = reserveSupply.add(t.txFee);
        bonusSupply = bonusSupply.add(t.sellFee).sub(t.buyBonus);

        _reflectFee(r.fee, t.fee);
        emit Transfer(sender, recipient, t.transferAmount);
    }

    function _transferBothExcluded(address sender, address recipient, uint256 tAmount, bool hasFee, TransferState transferState) private {
        (RValues memory r, TValues memory t) = _getValues(tAmount, hasFee, transferState);
        _tOwned[sender] = _tOwned[sender].sub(t.amount);
        _rOwned[sender] = _rOwned[sender].sub(r.amount);
        _tOwned[recipient] = _tOwned[recipient].add(t.transferAmount.add(t.buyBonus));
        _rOwned[recipient] = _rOwned[recipient].add(r.transferAmount.add(r.buyBonus));

        _tOwned[lord] = _tOwned[lord].add(t.txFee.add(t.sellFee)).sub(t.buyBonus);
        _rOwned[lord] = _rOwned[lord].add(r.txFee.add(r.sellFee)).sub(r.buyBonus);
        reserveSupply = reserveSupply.add(t.txFee);
        bonusSupply = bonusSupply.add(t.sellFee).sub(t.buyBonus);

        _reflectFee(r.fee, t.fee);
        emit Transfer(sender, recipient, t.transferAmount);
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount, bool hasFee, TransferState transferState) private view returns (RValues memory r, TValues memory t) {
        t = _getTValues(tAmount, hasFee, transferState);
        r = _getRValues(t, _getRate());
    }

    function _getTValues(uint256 tAmount, bool hasFee, TransferState transferState) private view returns (TValues memory t) {
        t.amount = tAmount;
        if (hasFee) {
            t.fee = tAmount.div(reflectFeeDenominator);
            t.txFee = transferState == TransferState.Buy ? tAmount.div(buyTxFeeDenominator) : tAmount.div(sellTxFeeDenominator);
            t.sellFee = transferState == TransferState.Sell ? tAmount.div(sellFeeDenominator) : 0;
            t.buyBonus = transferState == TransferState.Buy ? tAmount.div(buyBonusDenominator) : 0;
            if (t.buyBonus > 0) {
                t.buyBonus = bonusSupply > t.buyBonus ? t.buyBonus : bonusSupply;
            }
        }
        t.transferAmount = tAmount.sub(t.fee).sub(t.txFee).sub(t.sellFee);
    }

    function _getRValues(TValues memory t, uint256 currentRate) private pure returns (RValues memory r) {
        r.amount = t.amount.mul(currentRate);
        r.fee = t.fee.mul(currentRate);
        r.txFee = t.txFee.mul(currentRate);
        r.sellFee = t.sellFee.mul(currentRate);
        r.transferAmount = r.amount.sub(r.fee).sub(r.txFee).sub(r.sellFee);
        r.buyBonus = t.buyBonus.mul(currentRate);
    }

    function _getRate() private view returns (uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        for (uint256 i = 0; i < _reflectExcluded.length; i++) {
            if (_rOwned[_reflectExcluded[i]] > rSupply || _tOwned[_reflectExcluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_reflectExcluded[i]]);
            tSupply = tSupply.sub(_tOwned[_reflectExcluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 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 <0.8.0;

/**
 * @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 >=0.6.0 <0.8.0;

/**
 * @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 >=0.6.2 <0.8.0;

/**
 * @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 on 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");
        require(isContract(target), "Address: call to non-contract");

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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 <0.8.0;

import "../GSN/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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function migrator() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setMigrator(address) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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