Contract Source Code:

// SPDX-License-Identifier: MIT

/*
MIT License

Copyright (c) 2018 requestnetwork
Copyright (c) 2018 Fragments, Inc.
Copyright (c) 2020 Ditto Money
Copyright (c) 2021 Goes Up Higher
Copyright (c) 2021 Cryptographic Ultra Money

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

pragma solidity ^0.6.0;

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;
    }
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

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

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

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

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

interface ILP {
    function sync() external;
}


abstract contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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;
    }
}

/**
 * @title SafeMathInt
 * @dev Math operations for int256 with overflow safety checks.
 */
library SafeMathInt {
    int256 private constant MIN_INT256 = int256(1) << 255;
    int256 private constant MAX_INT256 = ~(int256(1) << 255);

    /**
     * @dev Multiplies two int256 variables and fails on overflow.
     */
    function mul(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a * b;

        // Detect overflow when multiplying MIN_INT256 with -1
        require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
        require((b == 0) || (c / b == a));
        return c;
    }

    /**
     * @dev Division of two int256 variables and fails on overflow.
     */
    function div(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        // Prevent overflow when dividing MIN_INT256 by -1
        require(b != -1 || a != MIN_INT256);

        // Solidity already throws when dividing by 0.
        return a / b;
    }

    /**
     * @dev Subtracts two int256 variables and fails on overflow.
     */
    function sub(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a));
        return c;
    }

    /**
     * @dev Adds two int256 variables and fails on overflow.
     */
    function add(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a));
        return c;
    }

    /**
     * @dev Converts to absolute value, and fails on overflow.
     */
    function abs(int256 a)
        internal
        pure
        returns (int256)
    {
        require(a != MIN_INT256);
        return a < 0 ? -a : a;
    }
}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address private _owner;
  address private _previousOwner;
  uint256 private _lockTime;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    _owner = msg.sender;
  }

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

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

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(_owner);
    _owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address newOwner) internal {
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
  
  function getUnlockTime() public view returns (uint256) {return _lockTime;}
  	
  function lock(uint256 time) public virtual onlyOwner {
	_previousOwner = _owner;
	_owner = address(0);
	_lockTime = block.timestamp + time;
	emit OwnershipTransferred(_owner, address(0));
	}
	
  function unlock() public virtual {
	require(_previousOwner == msg.sender, "You don't have permission to unlock");
	require(block.timestamp > _lockTime , "Contract is locked");
	emit OwnershipTransferred(_owner, _previousOwner);
	_owner = _previousOwner;
	}
}

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 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;
}

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;
}

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);
}

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;
}


/**
 * @title CUM ERC20 token
 * @dev  
 *      The goal of CUM is to be hardest money.
 *      Based on the Ampleforth protocol.
 */
contract CUM is Context, ERC20Detailed, Ownable {
    using SafeMath for uint256;
    using SafeMathInt for int256;
    
    mapping (address => bool) private _isExcludedFromFee;

	address BURN_ADDRESS = 0x0000000000000000000000000000000000000001;
	address public liq_locker;
	
	uint256 public _liquidityFee = 4;
    uint256 private _previousLiquidityFee = _liquidityFee;
    
    uint256 public _burnFee = 2;
	uint256 private _previousBurnFee = _burnFee;
	
	IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    
    uint256 public numTokensSellToAddToLiquidity = 66666 * 10**2 * 10**DECIMALS;
    
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SetLPEvent(address lpAddress);
    event SetLLEvent(address llAddress);
    event AddressExcluded(address exAddress);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }

    event LogRebase(uint256 indexed epoch, uint256 totalSupply);

    // Used for authentication
    address public master;
    
    // LP atomic sync
    address public lp;
    ILP public lpContract;

    modifier onlyMaster() {
        require(msg.sender == master);
        _;
    }
    
    // Only the owner can transfer tokens in the initial phase.
    // This is allow the AMM listing to happen in an orderly fashion.
    
    bool public initialDistributionFinished;
    
    mapping (address => bool) allowTransfer;
    
    modifier initialDistributionLock {
        require(initialDistributionFinished || isOwner() || allowTransfer[msg.sender]);
        _;
    }

    modifier validRecipient(address to) {
        require(to != address(0x0));
        require(to != address(this));
        _;
    }

    uint256 private constant DECIMALS = 9;
    uint256 private constant MAX_UINT256 = ~uint256(0);
    
    uint256 private constant INITIAL_FRAGMENTS_SUPPLY = 66666 * 10**6 * 10**DECIMALS;

    // TOTAL_GONS is a multiple of INITIAL_FRAGMENTS_SUPPLY so that _gonsPerFragment is an integer.
    // Use the highest value that fits in a uint256 for max granularity.
    uint256 private constant TOTAL_GONS = MAX_UINT256 - (MAX_UINT256 % INITIAL_FRAGMENTS_SUPPLY);

    // MAX_SUPPLY = maximum integer < (sqrt(4*TOTAL_GONS + 1) - 1) / 2
    uint256 private constant MAX_SUPPLY = ~uint128(0);  // (2^128) - 1

    uint256 private _totalSupply;
    uint256 private _gonsPerFragment;
    mapping(address => uint256) private _gonBalances;

    // This is denominated in Fragments, because the gons-fragments conversion might change before
    // it's fully paid.
    mapping (address => mapping (address => uint256)) private _allowedFragments;

    /**
     * @dev Notifies Fragments contract about a new rebase cycle.
     * @param supplyDelta The number of new fragment tokens to add into circulation via expansion.
     * @return The total number of fragments after the supply adjustment.
     */
    function rebase(uint256 epoch, int256 supplyDelta)
        external
        onlyMaster
        returns (uint256)
    {
        if (supplyDelta == 0) {
            emit LogRebase(epoch, _totalSupply);
            return _totalSupply;
        }

        if (supplyDelta < 0) {
            _totalSupply = _totalSupply.sub(uint256(-supplyDelta));
        } else {
            _totalSupply = _totalSupply.add(uint256(supplyDelta));
        }

        if (_totalSupply > MAX_SUPPLY) {
            _totalSupply = MAX_SUPPLY;
        }
        
        numTokensSellToAddToLiquidity = _totalSupply.div(10000);

        _gonsPerFragment = TOTAL_GONS.div(_totalSupply);
        lpContract.sync();

        emit LogRebase(epoch, _totalSupply);
        return _totalSupply;
    }

    constructor()
        ERC20Detailed("Cryptographic Ultra Money", "CUM", uint8(DECIMALS))
        public
    {
        _totalSupply = INITIAL_FRAGMENTS_SUPPLY;
        _gonBalances[msg.sender] = TOTAL_GONS;
        _gonsPerFragment = TOTAL_GONS.div(_totalSupply);
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
		uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
		uniswapV2Router = _uniswapV2Router;

        _isExcludedFromFee[owner()] = true;
		_isExcludedFromFee[address(this)] = true;
		_isExcludedFromFee[BURN_ADDRESS] = true;
        initialDistributionFinished = false;
        emit Transfer(address(0x0), msg.sender, _totalSupply);
    }

    /**
     * @notice Sets a new master
     */
    function setMaster(address masterAddress)
        external
        onlyOwner
        returns (uint256)
    {
        master = masterAddress;
    }
    
    /**
     * @notice Sets contract LP address
     */
    function setLP(address lpAddress)
        external
        onlyOwner
        returns (uint256)
    {
        lp = lpAddress;
        lpContract = ILP(lp);
        emit SetLPEvent(lp);
    }
    
    /**
     * @notice Sets Liquidity Locker address
     */
    function setLiqLocker(address llAddress)
        external
        onlyOwner
        returns (uint256)
    {
        liq_locker = llAddress;
        _isExcludedFromFee[liq_locker] = true;
        emit SetLLEvent(liq_locker);
    }

    
    /**
     * @notice Adds excluded address
     */
    function excludeFromFeeAdd(address exAddress)
        external
        onlyOwner
        returns (uint256)
    {
        _isExcludedFromFee[exAddress] = true;
        emit AddressExcluded(exAddress);
    }
    
    function excludeFromFeeRemove(address exAddress)
        external
        onlyOwner
        returns (uint256)
    {
        _isExcludedFromFee[exAddress] = false;
    }

    /**
     * @return The total number of fragments.
     */
    function totalSupply()
        public
        view
        override
        returns (uint256)
    {
        return _totalSupply;
    }

    /**
     * @param who The address to query.
     * @return The balance of the specified address.
     */
    function balanceOf(address who)
        public
        view
        override
        returns (uint256)
    {
        return _gonBalances[who].div(_gonsPerFragment);
    }
    
    function _approve(address owner, address spender, uint256 value) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowedFragments[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Transfer tokens to a specified address.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @return True on success, false otherwise.
     */
    function transfer(address to, uint256 value)
        public
        validRecipient(to)
        initialDistributionLock
        override
        returns (bool)
    {
        _transfer(_msgSender(), to, value);
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner has allowed to a spender.
     * @param owner_ The address which owns the funds.
     * @param spender The address which will spend the funds.
     * @return The number of tokens still available for the spender.
     */
    function allowance(address owner_, address spender)
        public
        view
        override
        returns (uint256)
    {
        return _allowedFragments[owner_][spender];
    }

    /**
     * @dev Transfer tokens from one address to another.
     * @param sender The address you want to send tokens from.
     * @param recipient The address you want to transfer to.
     * @param value The amount of tokens to be transferred.
     */
    function transferFrom(address sender, address recipient, uint256 value)
        public
        validRecipient(recipient)
        override
        returns (bool)
    {
        _transfer(sender, recipient, value);
        _approve(sender, _msgSender(), _allowedFragments[sender][_msgSender()].sub(value));
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of
     * msg.sender. This method is included for ERC20 compatibility.
     * increaseAllowance and decreaseAllowance should be used instead.
     * Changing an allowance with this method brings the risk that someone may transfer both
     * the old and the new allowance - if they are both greater than zero - if a transfer
     * transaction is mined before the later approve() call is mined.
     *
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value)
        public
        initialDistributionLock
        override
        returns (bool)
    {
        _allowedFragments[_msgSender()][spender] = value;
        emit Approval(_msgSender(), spender, value);
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner has allowed to a spender.
     * This method should be used instead of approve() to avoid the double approval vulnerability
     * described above.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        external
        initialDistributionLock
        returns (bool)
    {
        _allowedFragments[_msgSender()][spender] = _allowedFragments[_msgSender()][spender].add(addedValue);
        emit Approval(_msgSender(), spender, _allowedFragments[_msgSender()][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner has allowed to a spender.
     *
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        external
        initialDistributionLock
        returns (bool)
    {
        uint256 oldValue = _allowedFragments[_msgSender()][spender];
        if (subtractedValue >= oldValue) {
            _allowedFragments[_msgSender()][spender] = 0;
        } else {
            _allowedFragments[_msgSender()][spender] = oldValue.sub(subtractedValue);
        }
        emit Approval(_msgSender(), spender, _allowedFragments[_msgSender()][spender]);
        return true;
    }
    
    function setInitialDistributionFinished()
        external 
        onlyOwner 
    {
        initialDistributionFinished = true;
    }
    
    function enableTransfer(address _addr)
        external 
        onlyOwner 
    {
        allowTransfer[_addr] = true;
    }
    
    function removeAllFee() private {
        if(_burnFee == 0 && _liquidityFee == 0) return;
        
        _previousBurnFee = _burnFee;
        _previousLiquidityFee = _liquidityFee;
        
        _burnFee = 0;
        _liquidityFee = 0;
    }
    
    function restoreAllFee() private {
        _burnFee = _previousBurnFee;
        _liquidityFee = _previousLiquidityFee;
    }
    
    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    function _transfer(
		address from,
		address to,
		uint256 amount
	) private {
		require(from != address(0), "ERC20: transfer from the zero address");
		require(to != address(0), "ERC20: transfer to the zero address");
		require(amount > 0, "Transfer amount must be greater than zero");
		
		uint256 contractTokenBalance = balanceOf(address(this));

        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
        if (
            overMinTokenBalance &&
            !inSwapAndLiquify &&
            from != uniswapV2Pair &&
            swapAndLiquifyEnabled
        ) {
            contractTokenBalance = numTokensSellToAddToLiquidity;
            swapAndLiquify(contractTokenBalance);
        }

		bool takeFee = true;
		if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
			takeFee = false;
		}
		_tokenTransfer(from, to, amount, takeFee);
	}
	
	function setBurnFeePercent(uint256 burnFee) external onlyOwner() {
	    require(burnFee <= 10);
        _burnFee = burnFee;
    }
    
    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
	    require(liquidityFee <= 10);
        _liquidityFee = liquidityFee;
    }
   
    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }
    
    receive() external payable {}

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        // split the contract balance into halves
        uint256 half = contractTokenBalance.div(2);
        uint256 otherHalf = contractTokenBalance.sub(half);

        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the liquidity event include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered

        // how much ETH did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity to uniswap
        addLiquidity(otherHalf, newBalance);
        
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            liq_locker,
            block.timestamp
        );
    }

	function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee) private {
		if(!takeFee)
			removeAllFee();		
		_transferStandard(sender, recipient, amount);
		if(!takeFee)
			restoreAllFee();
	}
	
	function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
		return _amount.mul(_liquidityFee).div(
			10**2
		);
	}

	function calculateBurnFee(uint256 _amount) private view returns (uint256) {
		return _amount.mul(_burnFee).div(
			10**2
		);
	}
	
	function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256) {
        uint256 tBurn = calculateBurnFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tBurn).sub(tLiquidity);
        return (tTransferAmount, tBurn, tLiquidity);
    }

    function _transferBurn(uint256 tBurn) private {
		_gonBalances[BURN_ADDRESS] = _gonBalances[BURN_ADDRESS].add(tBurn);
	}
	
	function _takeLiquidity(uint256 tLiquidity) private {
        _gonBalances[address(this)] = _gonBalances[address(this)].add(tLiquidity);
    }

	function _transferStandard(address sender, address recipient, uint256 tAmount) private {
	    uint256 gonValue = tAmount.mul(_gonsPerFragment);
	    (uint256 tTransferAmount, uint256 tBurn, uint256 tLiquidity) = _getTValues(gonValue);
        _gonBalances[sender] = _gonBalances[sender].sub(gonValue);
		_gonBalances[recipient] = _gonBalances[recipient].add(tTransferAmount);
		_transferBurn(tBurn);
		_takeLiquidity(tLiquidity);
		emit Transfer(sender, BURN_ADDRESS, tBurn.div(_gonsPerFragment));
		emit Transfer(sender, address(this), tLiquidity.div(_gonsPerFragment));
		emit Transfer(sender, recipient, tTransferAmount.div(_gonsPerFragment));
	}

}