Why is y/'r missed out? The Tips & notes section said that "y rheina" means "those/those ones".
It is a mistake, and thank you for pointing it out. It should be Faint ydy/yw'r rheina/rheini?
Edit - I cannot delete the incorrect question, but I have added the correct version - this should mean that the incorrect version only comes up half the time. The correction has been made ready for Tree2