@Mats: I added a favorable comment on the page linking to your excellent
hiashatar ZRF, which I will not repeat here.
I only wanted to give a link for anyone interested in the kind of diagram
to which I refer in native shatar literature:
http://shop.kongfz.com/show_pics.php?shopId=6625&bookId=34840797
The image shows some pieces in a diagram that decorate the book cover of a
problem collection. I wish I had clearer page images to refer to, but the
point is somewhat moot, given the fine, aesthetically pleasing solution
that Mats offers in his ZRF.