code: func AreSame(h1 *Height, h2 *Height) bool {
  	if h1 == nil {
  		return h2 == nil
  	}
  	if h2 == nil {
  		return false
  	}
  	return h1.Compare(h2) == 0
  }
docs: // AreSame returns true if both the heights are either nil or equal