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  "source": "pragma solidity ^0.4.25;\n\ncontract CallbackClient {\n\n    mapping(bytes32=>bytes32) public answers;\n\n    event LogCallback(\n        bytes32 question_id,\n        bytes32 question_answer,\n        address sender\n    );\n\n    function __realitycheck_callback(bytes32 question_id, bytes32 question_answer) \n    public {\n        answers[question_id] = question_answer;\n        emit LogCallback(question_id, question_answer, msg.sender);\n    }\n\n}\n",
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