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  "source": "pragma solidity ^0.4.21;\n\n\n/**\n * @title Ownable\n * @dev The Ownable contract has an owner address, and provides basic authorization control\n * functions, this simplifies the implementation of \"user permissions\".\n */\ncontract Ownable {\n  address public owner;\n\n\n  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n\n  /**\n   * @dev The Ownable constructor sets the original `owner` of the contract to the sender\n   * account.\n   */\n  function Ownable() public {\n    owner = msg.sender;\n  }\n\n  /**\n   * @dev Throws if called by any account other than the owner.\n   */\n  modifier onlyOwner() {\n    require(msg.sender == owner);\n    _;\n  }\n\n  /**\n   * @dev Allows the current owner to transfer control of the contract to a newOwner.\n   * @param newOwner The address to transfer ownership to.\n   */\n  function transferOwnership(address newOwner) public onlyOwner {\n    require(newOwner != address(0));\n    emit OwnershipTransferred(owner, newOwner);\n    owner = newOwner;\n  }\n\n}\n",
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