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// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;

import "./interfaces/IERC20.sol";
import "@openzeppelin/contracts/proxy/Proxy.sol";

contract SigmaFallThrough is Proxy {
  address internal constant FFF = 0xaBAfA52D3d5A2c18A4C1Ae24480D22B831fC0413;
  address internal immutable drainReversalImplementation;

  constructor(address _drainReversalImplementation) {
    drainReversalImplementation = _drainReversalImplementation;
  }

  function _implementation() internal view virtual override returns (address) {
    if (address(this) == FFF) {
      return drainReversalImplementation;
    }
    return 0x7B3B2B39CbdBddaDC13D8559D82c054b9C2fd5f3;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;

interface IERC20 {
  event Approval(address indexed src, address indexed dst, uint256 amt);
  event Transfer(address indexed src, address indexed dst, uint256 amt);

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

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

  function decimals() external view returns (uint8);

  function totalSupply() external view returns (uint256);

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

  function transfer(address recipient, uint256 amount) external returns (bool);

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

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

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_drainReversalImplementation","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"stateMutability":"payable","type":"receive"}]

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

0x608060405236601057600e6013565b005b600e5b60196025565b602560216027565b6084565b565b60003073abafa52d3d5a2c18a4c1ae24480d22b831fc04131415606a57507f000000000000000000000000c4f7f1ca35046b58e9f34de8d6f667b6cadf01016081565b50737b3b2b39cbdbddadc13d8559d82c054b9c2fd5f35b90565b3660008037600080366000845af43d6000803e80801560a2573d6000f35b3d6000fdfea164736f6c6343000706000a

000000000000000000000000c4f7f1ca35046b58e9f34de8d6f667b6cadf0101

-----Decoded View---------------
Arg [0] : _drainReversalImplementation (address): 0xC4f7F1Ca35046B58e9F34DE8D6f667B6caDF0101

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000c4f7f1ca35046b58e9f34de8d6f667b6cadf0101