Short and long "'neoacute "'are also traditionally marked with two different symbols, and we're also dealing with the same prosodeme on short and long vowels.
2.
There is some variation in the interpretations of vowel length's phonemicity ., for example, treats vowel quantity as its own separate phoneme ( a " prosodeme " ) so that long and short vowels are allophones of a single vowel phoneme.
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