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library SafeMathMod // Partial SafeM ...    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)  contract Usdcoins //is inherently ... *    - function()    - function Usdcoins()    - function transfer(address _to, uint25 ...    - function transferFrom(address _from, ...    - function multiPartyTransfer(address[] ...    - function multiPartyTransferFrom(addre ...    - function approve(address _spender, ui ...    - function allowance(address _owner, ad ...    - function isNotContract(address _addr)

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/**
 *Submitted for verification at Etherscan.io on 2018-04-02
*/

pragma solidity ^0.4.17;

library SafeMathMod { // Partial SafeMath Library

    function mul(uint256 a, uint256 b) constant internal returns(uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) constant internal returns(uint256) {
        assert(b != 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns(uint256 c) {
        require((c = a - b) < a);
    }

    function add(uint256 a, uint256 b) internal pure returns(uint256 c) {
        require((c = a + b) > a);
    }
}

contract Usdcoins { //is inherently ERC20
    using SafeMathMod
    for uint256;

    /**
     * @constant name The name of the token
     * @constant symbol  The symbol used to display the currency
     * @constant decimals  The number of decimals used to dispay a balance
     * @constant totalSupply The total number of tokens times 10^ of the number of decimals
     * @constant MAX_UINT256 Magic number for unlimited allowance
     * @storage balanceOf Holds the balances of all token holders
     * @storage allowed Holds the allowable balance to be transferable by another address.
     */

    address owner;



    string constant public name = "Usdcoins";

    string constant public symbol = "USDC";

    uint256 constant public decimals = 18;

    uint256 constant public totalSupply = 100000000e18;

    uint256 constant private MAX_UINT256 = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowed;

    event Transfer(address indexed _from, address indexed _to, uint256 _value);

    event TransferFrom(address indexed _spender, address indexed _from, address indexed _to, uint256 _value);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function() payable {
        revert();
    }

    function Usdcoins() public {
        balanceOf[msg.sender] = totalSupply;
        owner = msg.sender;
    }



    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }




    /**
     * @dev function that sells available tokens
     */


    function transfer(address _to, uint256 _value) public returns(bool success) {
        /* Ensures that tokens are not sent to address "0x0" */
        require(_to != address(0));
        /* Prevents sending tokens directly to contracts. */


        /* SafeMathMOd.sub will throw if there is not enough balance and if the transfer value is 0. */
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
        balanceOf[_to] = balanceOf[_to].add(_value);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
     * @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
     *
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value The amount of token to be transferred
     * @return Whether the transfer was successful or not
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns(bool success) {
        /* Ensures that tokens are not sent to address "0x0" */
        require(_to != address(0));
        /* Ensures tokens are not sent to this contract */


        uint256 allowance = allowed[_from][msg.sender];
        /* Ensures sender has enough available allowance OR sender is balance holder allowing single transsaction send to contracts*/
        require(_value <= allowance || _from == msg.sender);

        /* Use SafeMathMod to add and subtract from the _to and _from addresses respectively. Prevents under/overflow and 0 transfers */
        balanceOf[_to] = balanceOf[_to].add(_value);
        balanceOf[_from] = balanceOf[_from].sub(_value);

        /* Only reduce allowance if not MAX_UINT256 in order to save gas on unlimited allowance */
        /* Balance holder does not need allowance to send from self. */
        if (allowed[_from][msg.sender] != MAX_UINT256 && _from != msg.sender) {
            allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        }
        Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Transfer the specified amounts of tokens to the specified addresses.
     * @dev Be aware that there is no check for duplicate recipients.
     *
     * @param _toAddresses Receiver addresses.
     * @param _amounts Amounts of tokens that will be transferred.
     */
    function multiPartyTransfer(address[] _toAddresses, uint256[] _amounts) public {
        /* Ensures _toAddresses array is less than or equal to 255 */
        require(_toAddresses.length <= 255);
        /* Ensures _toAddress and _amounts have the same number of entries. */
        require(_toAddresses.length == _amounts.length);

        for (uint8 i = 0; i < _toAddresses.length; i++) {
            transfer(_toAddresses[i], _amounts[i]);
        }
    }

    /**
     * @dev Transfer the specified amounts of tokens to the specified addresses from authorized balance of sender.
     * @dev Be aware that there is no check for duplicate recipients.
     *
     * @param _from The address of the sender
     * @param _toAddresses The addresses of the recipients (MAX 255)
     * @param _amounts The amounts of tokens to be transferred
     */
    function multiPartyTransferFrom(address _from, address[] _toAddresses, uint256[] _amounts) public {
        /* Ensures _toAddresses array is less than or equal to 255 */
        require(_toAddresses.length <= 255);
        /* Ensures _toAddress and _amounts have the same number of entries. */
        require(_toAddresses.length == _amounts.length);

        for (uint8 i = 0; i < _toAddresses.length; i++) {
            transferFrom(_from, _toAddresses[i], _amounts[i]);
        }
    }

    /**
     * @notice `msg.sender` approves `_spender` to spend `_value` tokens
     *
     * @param _spender The address of the account able to transfer the tokens
     * @param _value The amount of tokens to be approved for transfer
     * @return Whether the approval was successful or not
     */
    function approve(address _spender, uint256 _value) public returns(bool success) {
        /* Ensures address "0x0" is not assigned allowance. */
        require(_spender != address(0));

        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @param _owner The address of the account owning tokens
     * @param _spender The address of the account able to transfer the tokens
     * @return Amount of remaining tokens allowed to spent
     */
    function allowance(address _owner, address _spender) public view returns(uint256 remaining) {
        remaining = allowed[_owner][_spender];
    }

    function isNotContract(address _addr) private view returns(bool) {
        uint length;
        assembly {
            /* retrieve the size of the code on target address, this needs assembly */
            length: = extcodesize(_addr)
        }
        return (length == 0);
    }

}

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