Vowel-reducing paradigms
The largest class of vowel-reducing nouns have á or é between the first and second radicals that reduces to a (i after a y) when a suffix is added.
"Crawling-up" nouns
The "crawling-up" (Netagin: mittzúchábh) nouns underlyingly end in a consonant cluster. In the singular oblique cases the stem is turned into a CaCC (if the bare form is CeCaC, CiCC for CéCaC and CoCC for CóCaC) form, and the dual and plural turn the stem into (CaCáC, CeCáC and CoCáC).
-eh
The suffix -eh is deleted before a case ending.