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2.2.2. Do all potential counterparts alternate?

	Finn.	Seto	Er.	HMr	MMr	Ud.	Hun.	SMn	SKh	VKh	Nga.	Ka.
F/B	yes	no	yes or no	no	no	no	yes	?	no	no	no	no
R\|T	—	—	—	—	no	—	no	?	—	—	no	—

Erzya: If we consider that there is an /o/ : /e/ alternation, we could also expect an /u/ : /i/ alternation (which, instead of or in addition to the /o/ : /e/ alternation, actually exists in dialects). Although if we consider that the vowels /u/ and /i/ (similarly to /o/ and /e/) are not a perfect alternating pair (they differ not just in F/B, but also in rounding), we could conclude that /u/ : /i/ alternation is impossible because they are not a good candidate for an alternating pair. However, due to the fact that /u/ is in principle prohibited in non-initial syllables, and the dialects show that the difference in rounding does not exclude the alternation between high vowels either, it seems to be more convincing to analyse /i/ and /u/ as a potential alternating pair (at least in Erzya).