{
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  "source": "pragma solidity ^0.4.11;\n\n/**\n * @title Helps contracts guard agains rentrancy attacks.\n * @author Remco Bloemen <remco@2π.com>\n * @notice If you mark a function `nonReentrant`, you should also\n * mark it `external`.\n */\ncontract ReentrancyGuard {\n\n  /**\n   * @dev We use a single lock for the whole contract.\n   */\n  bool private rentrancy_lock = false;\n\n  /**\n   * @dev Prevents a contract from calling itself, directly or indirectly.\n   * @notice If you mark a function `nonReentrant`, you should also\n   * mark it `external`. Calling one nonReentrant function from\n   * another is not supported. Instead, you can implement a\n   * `private` function doing the actual work, and a `external`\n   * wrapper marked as `nonReentrant`.\n   */\n  modifier nonReentrant() {\n    require(!rentrancy_lock);\n    rentrancy_lock = true;\n    _;\n    rentrancy_lock = false;\n  }\n\n}\n",
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