subrule getter _setter (PictureRule pic_b) = PictureRule pic_a
  where
    pic_a n = pic_b n . getter
subrule getter _setter (PictureRule pic_b) = PictureRule pic_a
  where
    pic_a n = pic_b n . getter
subrule getter _setter (PictureRule pic_b) = PictureRule pic_a
  where
    pic_a n = pic_b n . getter