I thought that Limerick poems have to start with a reference to a place or town. The name Limerick the eponymous origin for the style.
Essential to traditional Limerick poetry is also a unfortunate or humerous last line.
I don't know why I have no idea what is the unrepeatable word omitted and then cause by omission for praise, but it would be in classic Limerick form to use it at the end where it remains unspoken for effect and publishing eligibility.