Yes, when I started with a limerick,
Beck gave me the AABB stuff, rhythm, rhyming, et. al.
But he says at the end:

"Ideally five lines AABBA, rhyming, suggestive in content, with
a clever hook in the last line".

Of course back when Reader's Digest had a different one each
week, they were never "suggestive", but then again that was
Reader's Digest.

This is great Peter.

----please, draw me a sheep----