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//////////////////////////////////////////////////
//SYNLEV BULL CONTRACT V 1.0.0
//////////////////////////

//THIS IS STANDARD OPENZEPLIN ERC-20 CONTRACT WITH BURN/MINT RESTRICTED TO VAULT
//CONTRACT

pragma solidity >= 0.6.4;

import './ownable.sol';
import './SafeMath.sol';
import './IERC20.sol';

contract bull is IERC20, Owned {
  using SafeMath for uint256;

  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);

  constructor() public {
    symbol = "BULL";
    name = "3xBULLETH/USD";
    decimals = 18;
    vault = 0xFf40827Ee1c4Eb6052044101E1C6E28DBe1440e3;
  }

  modifier onlyVault {
    require(msg.sender == vault);
    _;
  }

  address public vault;


  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowances;

  uint256 private _totalSupply;

  string public name;
  string public symbol;
  uint256 public decimals;

  //allows admin to withdraw other ERC-20 tokens from the contract.
  function adminwithdrawal(IERC20 token, uint256 amount) public onlyOwner() {
    IERC20 thisToken = IERC20(address(this));
    require(token != thisToken);
    token.transfer(msg.sender, amount);
  }

  function mint(address account, uint256 amount) public override onlyVault() {
    _mint(account, amount);
  }
  function burn(uint256 amount) public override onlyVault() {
    _burn(msg.sender, amount);
  }

  function totalSupply() public view override returns (uint256) {
      return _totalSupply;
  }
  function balanceOf(address account) public view override returns (uint256) {
      return _balances[account];
  }
  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
      _transfer(_msgSender(), recipient, amount);
      return true;
  }
  function allowance(address owner, address spender) public view virtual override returns (uint256) {
      return _allowances[owner][spender];
  }
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
      _approve(_msgSender(), spender, amount);
      return true;
  }
  function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
      _transfer(sender, recipient, amount);
      _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
      return true;
  }
  function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
      _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
      return true;
  }
  function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
      _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
      return true;
  }
  function _transfer(address sender, address recipient, uint256 amount) internal virtual {
      require(sender != address(0), "ERC20: transfer from the zero address");
      require(recipient != address(0), "ERC20: transfer to the zero address");

      _beforeTokenTransfer(sender, recipient, amount);

      _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
      _balances[recipient] = _balances[recipient].add(amount);
      emit Transfer(sender, recipient, amount);
  }
  function _mint(address account, uint256 amount) internal virtual {
      require(account != address(0), "ERC20: mint to the zero address");

      _beforeTokenTransfer(address(0), account, amount);

      _totalSupply = _totalSupply.add(amount);
      _balances[account] = _balances[account].add(amount);
      emit Transfer(address(0), account, amount);
  }
  function _burn(address account, uint256 amount) internal virtual {
      require(account != address(0), "ERC20: burn from the zero address");

      _beforeTokenTransfer(account, address(0), amount);

      _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
      _totalSupply = _totalSupply.sub(amount);
      emit Transfer(account, address(0), amount);
  }
  function _approve(address owner, address spender, uint256 amount) internal virtual {
      require(owner != address(0), "ERC20: approve from the zero address");
      require(spender != address(0), "ERC20: approve to the zero address");

      _allowances[owner][spender] = amount;
      emit Approval(owner, spender, amount);
  }
  function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

pragma solidity >= 0.6.4;

interface IERC20 {
  function totalSupply() external view returns (uint256);
  function balanceOf(address account) external view returns (uint256);
  function transfer(address recipient, uint256 amount) external returns (bool);
  function allowance(address owner, address spender) external view returns (uint256);
  function approve(address spender, uint256 amount) external returns (bool);
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
  function mint(address account, uint256 amount) external;
  function burn(uint256 amount) external;
  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

pragma solidity ^0.6.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

contract Owned is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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