= 5.1. Invariancy (nonalternation)

^ ^ Finn. ^  Seto ^ Er. ^ HMr ^ MMr ^ Ud. ^ Hun. ^ SMn ^ SKh ^ VKh ^ Nga. ^ Ka. ^
^ F/B. | i, e | i | i, ɑ | i, e | i, e, ɑ, ə̆ | i, e, o, ɑ, ɘ̆  | i(ː), eː, ɛ  | ? | i, e | 0 | all | i |
^ R%%|%%T | – | – | – | – | i, e, ɑ, ə̆ | – | all but o, ø | ? | – | – | ɘ, ɑ, i̯ɑ, u̯ɑ | all but ə̆  |

  ; Finnish, Seto, Hill Mari, Hungarian F/B, Vakh/Vasyugan Khanty, Kamas F/B harmony
  : Unrounded front vowels having no back counterpart do not undergo harmony but can follow both back-harmonic and front-harmonic vowels. In the case of Vakh/Vasyugan Khanty, /e/ has no back counterpart, but it does not occur in non-initial syllables.

  ; Hungarian rounding harmony
  : Since only three vowels can undergo harmony (/ɛ/ : /ø/ : /o/) but /ɛ/ also participates in another alternation (/ɛ/ : /ɒ/), only the distribution of /ø/ and /o/ is restricted by harmony.

  ; Kamas total harmony
  : Since the only target of total harmony can be /ə̆/, any other vowel can follow another vowel. (However, rounded vowels seem to occur typically after other rounded vowels, further investigation needed.)

  ; Erzya
  : /ɑ/ has no front counterpart but frequently occurs after front vowels. /i/ is rare in non-initial vowels, although it occurs in verbal suffixes. /u/ is rare in non-initial syllables, and it never occurs in suffixes.

  ; Meadow Mari
  : Since only the word-final vowel undergoes harmony, the vowel of the initial syllable can be followed by any vowel which may occur in non-initial syllables (i.e. any unrounded vowel).  

  ; Southern Khanty
  : The vowels /i/ and /e/ have no back counterparts: they can follow both front and back vowels, although after the latter they can undergo harmony allophonically.

  ; Nganasan quasi-rounding harmony
  : All the harmonic vowels are reported to occur in non-alternating suffixes (except for /i̯ɑ/), and stems containing any of the vowels can change suffixes containing alternating allophones belonging to the opposite class, therefore any vowel can follow any other. F/B harmony: Since this harmony is parasitic on high vowels, non-high vowels can follow both front and back vowels.