// Contract: Chip
// Target function: function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory)
// 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;																									
}																									
}																									
																									
																									
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);																									
}																									
																									
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;																									
}																									
}																									
																									
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) {																									
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts																									
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned																									
// for accounts without code, i.e. `keccak256('')`																									
bytes32 codehash;																									
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;																									
// solhint-disable-next-line no-inline-assembly																									
assembly { codehash := extcodehash(account) }																									
return (codehash != accountHash && codehash != 0x0);																									
}																									
																									
/**																									
* @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);																									
}