library SafeMathLib {

/**
* Issue: Change to internal constant
**/
  function minus(uint a, uint b) internal constant returns (uint) {
    assert(b <= a);
    return a - b;
  }

/**
* Issue: Change to internal constant
**/
  function plus(uint a, uint b) internal constant returns (uint) {
    uint c = a + b;
    assert(c>=a && c>=b);
    return c;
  }

}
/**
 * Checking overflows for various operations
 */
function minus(uint a, uint b) internal constant returns (uint) {
  assert(b <= a);
  return a - b;
}

/**
 * Issue: Change to internal constant
 **/