@Override
public int hashCode()
{
  final int prime = 31;
  int result = 1;
  result = prime * result + ((one == null) ? 0 : one.hashCode());
  result = prime * result + ((two == null) ? 0 : two.hashCode());
  result = prime * result + ((three == null) ? 0 : three.hashCode());
  result = prime * result + ((four== null) ? 0 : four.hashCode());
  // ...
  return result;
}