Cuzco Quechua language

Cuzco Quechua (Qusqu qhichwa simi) is a dialect of Southern Quechua spoken in Cuzco and the Cuzco Region of Peru.

It is the Quechua variety used by the Academia Mayor de la Lengua Quechua in Cuzco, which also prefers the Spanish-based five-vowel alphabet. On the other hand, the official alphabet used by the ministry of education has only three vowels.

Phonology
There is debate about whether Cuzco Quechua has five or three vowel phonemes:. While historically Proto-Quechua clearly had just three vowel phonemes /*a, *ɪ, *ʊ/, and although some other Quechua varieties have an increased number of vowels as a result of phonological vowel length emergence or of monophthongization, the current debate about the Cuzco variety seems to be not phonological in matter but just orthographic.