= 2.2.4. Irregular alternations

^  ^ Finn. ^ Seto ^ Er. ^ HMr ^ MMr ^ Ud. ^ Hun. ^ SMn ^ SKh ^ VKh ^ Nga. ^ Ka. ^
^ F/B | 0 | 0 | 1 | 0 | 0 | 0 | 3 | ? | 2 | 0 | 0 | 0 |
^ R%%|%%T | — | — | — | — | 0 | — | 1 | ? | — | — | 5 | — |

<fs smaller>
F/B: front/back harmony\\
R|T: rounding, total harmony\\
—: not applicable</fs>


  ; Erzya
  : /o/ : /e/ (difference in rounding)

  ; Hungarian
  : **F/B harmony:** /ɑː/ : /eː/, /o/ : /ɛ/ (difference in height), /ɒ/ : /ɛ/ (difference in rounding – which can be analyzed as phonetic, not phonological). **Rounding harmony:**  /ɛ/ : /ø/ (difference in height)

  ; Nganasan
  : In addition to the fact that /u̯ɑ/, although it belongs to the rounded class of vowels, is phonetically unrounded, all of its actual alternations (and almost all of those of /u̯ɑ/) are non-potential, since they alternate with high vowels, and some of these alternations are monophthong : diphthong alternations (i : ɑ,  ɨ : ɑ, i : u̯ɑ,  ɨ : u̯ɑ, i̯ɑ : ɑ).