Evidence for 2 rules linking words in Herbal A->B

[nablator]

If you want to explain all ed you also need a transformation such as ey->ed to account for the final ed (without y at the end).

But then how to explain the many eda? A possible solution is to append a word starting with a (al, ar, aiin) after some of the "ed" endings generated by the previous rule.

Words without a bench, like ychy,

You mean ydy? yty?