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 contract Token *    - function transfer(address _to, uint25 ...    - function approve(address _spender, ui ...    - function transferFrom(address _from, ...

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/**
 *Submitted for verification at Etherscan.io on 2020-12-05
*/

pragma solidity ^0.5.0;
contract Token {
    string  public name = "PiSwap Token";
    string  public symbol = "PIS";
    uint256 public totalSupply = 1000000000000000 ; // 9 million tokens
    uint8   public decimals = 8;
 
    event Transfer(
        address indexed _from,
        address indexed _to,
        uint256 _value
    );  

    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _value
    );
 
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    constructor() public {
        balanceOf[msg.sender] = totalSupply;
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= balanceOf[_from]);
        require(_value <= allowance[_from][msg.sender]);
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        allowance[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value);
        return true;
    }

    
}

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