{"fileName":"ERC20.sol","contractName":"ERC20","source":"pragma solidity ^0.5.2;\n\nimport \"zos-lib/contracts/Initializable.sol\";\nimport \"./IERC20.sol\";\nimport \"../../math/SafeMath.sol\";\n\n/**\n * @title Standard ERC20 token\n *\n * @dev Implementation of the basic standard token.\n * https://eips.ethereum.org/EIPS/eip-20\n * Originally based on code by FirstBlood:\n * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol\n *\n * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for\n * all accounts just by listening to said events. Note that this isn't required by the specification, and other\n * compliant implementations may not do it.\n */\ncontract ERC20 is Initializable, IERC20 {\n using SafeMath for uint256;\n\n mapping (address => uint256) private _balances;\n\n mapping (address => mapping (address => uint256)) private _allowed;\n\n uint256 private _totalSupply;\n\n /**\n * @dev Total number of tokens in existence\n */\n function totalSupply() public view returns (uint256) {\n return _totalSupply;\n }\n\n /**\n * @dev Gets the balance of the specified address.\n * @param owner The address to query the balance of.\n * @return A uint256 representing the amount owned by the passed address.\n */\n function balanceOf(address owner) public view returns (uint256) {\n return _balances[owner];\n }\n\n /**\n * @dev Function to check the amount of tokens that an owner allowed to a spender.\n * @param owner address The address which owns the funds.\n * @param spender address The address which will spend the funds.\n * @return A uint256 specifying the amount of tokens still available for the spender.\n */\n function allowance(address owner, address spender) public view returns (uint256) {\n return _allowed[owner][spender];\n }\n\n /**\n * @dev Transfer token to a specified address\n * @param to The address to transfer to.\n * @param value The amount to be transferred.\n */\n function transfer(address to, uint256 value) public returns (bool) {\n _transfer(msg.sender, to, value);\n return true;\n }\n\n /**\n * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n * Beware that changing an allowance with this method brings the risk that someone may use both the old\n * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n * @param spender The address which will spend the funds.\n * @param value The amount of tokens to be spent.\n */\n function approve(address spender, uint256 value) public returns (bool) {\n _approve(msg.sender, spender, value);\n return true;\n }\n\n /**\n * @dev Transfer tokens from one address to another.\n * Note that while this function emits an Approval event, this is not required as per the specification,\n * and other compliant implementations may not emit the event.\n * @param from address The address which you want to send tokens from\n * @param to address The address which you want to transfer to\n * @param value uint256 the amount of tokens to be transferred\n */\n function transferFrom(address from, address to, uint256 value) public returns (bool) {\n _transfer(from, to, value);\n _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));\n return true;\n }\n\n /**\n * @dev Increase the amount of tokens that an owner allowed to a spender.\n * approve should be called when _allowed[msg.sender][spender] == 0. To increment\n * allowed value is better to use this function to avoid 2 calls (and wait until\n * the first transaction is mined)\n * From MonolithDAO Token.sol\n * Emits an Approval event.\n * @param spender The address which will spend the funds.\n * @param addedValue The amount of tokens to increase the allowance by.\n */\n function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {\n _approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));\n return true;\n }\n\n /**\n * @dev Decrease the amount of tokens that an owner allowed to a spender.\n * approve should be called when _allowed[msg.sender][spender] == 0. To decrement\n * allowed value is better to use this function to avoid 2 calls (and wait until\n * the first transaction is mined)\n * From MonolithDAO Token.sol\n * Emits an Approval event.\n * @param spender The address which will spend the funds.\n * @param subtractedValue The amount of tokens to decrease the allowance by.\n */\n function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {\n _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));\n return true;\n }\n\n /**\n * @dev Transfer token for a specified addresses\n * @param from The address to transfer from.\n * @param to The address to transfer to.\n * @param value The amount to be transferred.\n */\n function _transfer(address from, address to, uint256 value) internal {\n require(to != address(0));\n\n _balances[from] = _balances[from].sub(value);\n _balances[to] = _balances[to].add(value);\n emit Transfer(from, to, value);\n }\n\n /**\n * @dev Internal function that mints an amount of the token and assigns it to\n * an account. This encapsulates the modification of balances such that the\n * proper events are emitted.\n * @param account The account that will receive the created tokens.\n * @param value The amount that will be created.\n */\n function _mint(address account, uint256 value) internal {\n require(account != address(0));\n\n _totalSupply = _totalSupply.add(value);\n _balances[account] = _balances[account].add(value);\n emit Transfer(address(0), account, value);\n }\n\n /**\n * @dev Internal function that burns an amount of the token of a given\n * account.\n * @param account The account whose tokens will be burnt.\n * @param value The amount that will be burnt.\n */\n function _burn(address account, uint256 value) internal {\n require(account != address(0));\n\n _totalSupply = _totalSupply.sub(value);\n _balances[account] = _balances[account].sub(value);\n emit Transfer(account, address(0), value);\n }\n\n /**\n * @dev Approve an address to spend another addresses' tokens.\n * @param owner The address that owns the tokens.\n * @param spender The address that will spend the tokens.\n * @param value The number of tokens that can be spent.\n */\n function _approve(address owner, address spender, uint256 value) internal {\n require(spender != address(0));\n require(owner != address(0));\n\n _allowed[owner][spender] = value;\n emit Approval(owner, spender, value);\n }\n\n /**\n * @dev Internal function that burns an amount of the token of a given\n * account, deducting from the sender's allowance for said account. Uses the\n * internal burn function.\n * Emits an Approval event (reflecting the reduced allowance).\n * @param account The account whose tokens will be burnt.\n * @param value The amount that will be burnt.\n */\n function _burnFrom(address account, uint256 value) internal {\n _burn(account, value);\n _approve(account, msg.sender, _allowed[account][msg.sender].sub(value));\n }\n\n uint256[50] private 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