In the past, when they were recognised at all, they were often viewed as simply an extra vowel height, and the choice of symbols differed between authors since standard IPA does not recognise the possibility of so many contrastive close vowel heights . when immediately followed by a syllable containing the close vowels or.
22.
It appears that some varieties of Amstetten has thirteen long vowels, reported to distinguish five heights ( close, close-mid, mid, open-mid and open ) each among the front unrounded, front rounded, and back rounded vowels, plus an open central vowel, thus five vowel heights on the whole :.
23.
This labialization results in the consonant being pronounced with rounded lipsIn Sesotho, when a consonant is followed by a vowel, the shape of the lips is changed to resemble the shape of the vowel while the consonant is being pronounced ( or even before, when the syllable is the first after a pause ) with the shaping being more severe the higher the vowel height.
