Not all plurals ending in "ae" are accounted for

[XanC]

alumnae, florae, formulae, tarantulae.

https://en.wiktionary.org/wiki/Category:English_irregular_plurals_ending_in_%22-ae%22

I would suggest normalizing "æ" to "ae" before processing.

[benkasminbullock]

As per comments on other issues.