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"source": "// ------------------------------------------------------------------------------\n// This file is part of netvote.\n//\n// netvote is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// netvote is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with solidity. If not, see \n//\n// (c) 2017 netvote contributors.\n//------------------------------------------------------------------------------\n\npragma solidity ^0.4.17;\n\n\n/**\n * @title Bytes32Set\n * @dev iterable map of bytes32 for that modifies size upon removal\n * Note that the order changes upon removal.\n */\nlibrary Bytes32Set {\n\n struct SetData {\n mapping(bytes32 => bool) entryExists;\n mapping(bytes32 => uint256) entryIndex;\n bytes32[] entries;\n }\n\n function indexOf(SetData storage self, bytes32 b) public constant returns (uint256) {\n return self.entryIndex[b];\n }\n\n function getAt(SetData storage self, uint256 index) public constant returns (bytes32) {\n return self.entries[index];\n }\n\n function contains(SetData storage self, bytes32 b) public constant returns (bool) {\n return self.entryExists[b];\n }\n\n function size(SetData storage self) public constant returns (uint256) {\n return self.entries.length;\n }\n\n function put(SetData storage self, bytes32 b) public 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