{
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          "type": "address"
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  "source": "pragma solidity ^0.4.18;\n\ncontract BalanceHolder {\n\n    mapping(address => uint256) public balanceOf;\n\n    event LogWithdraw(\n        address indexed user,\n        uint256 amount\n    );\n\n    function withdraw() \n    public {\n        uint256 bal = balanceOf[msg.sender];\n        balanceOf[msg.sender] = 0;\n        msg.sender.transfer(bal);\n        emit LogWithdraw(msg.sender, bal);\n    }\n\n}\n",
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