code: func (s *SizeType) Orientation() string {
  	if s == nil || s.Ht == s.Wd {
  		return ""
  	}
  	if s.Wd > s.Ht {
  		return "L"
  	}
  	return "P"
  }
docs: // Orientation returns the orientation of a given size:
  // "P" for portrait, "L" for landscape