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  "source": "// SPDX-License-Identifier: LGPL-3.0-only\n/// Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md\npragma solidity ^0.7.0;\n\n/// @title Abstract token contract - Functions to be implemented by token contracts\nabstract contract Token {\n    /*\n     *  Events\n     */\n    event Transfer(address indexed from, address indexed to, uint value);\n    event Approval(address indexed owner, address indexed spender, uint value);\n\n    /*\n     *  Public functions\n     */\n    function transfer(address to, uint value) public virtual returns (bool);\n    function transferFrom(address from, address to, uint value) public virtual returns (bool);\n    function approve(address spender, uint value) public virtual returns (bool);\n    function balanceOf(address owner) public virtual view returns (uint);\n    function allowance(address owner, address spender) public virtual view returns (uint);\n    function totalSupply() public virtual view returns (uint);\n}\n",
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