"... thus increasing/raising the inventory to 16 mutually contrastive segments"

Xung, a Khoisan language, is reported to have **141 phonemes, or mutually contrastive sets of sounds**. A second aspect of phonological typology classifies ...
pandora.cii.wwu.edu/vajda/ling201/test2materials/Phonology3.htm

Rotokas, spoken by a few thousand people on Bougainville Island, **has only 11 mutually contrastive sounds**: five vowels and six consonants. ...
djringer.blogspot.com/2006/04/more-fun-with-phonemes.html

As the latter part of a vowel sequence, only the schwa or the reduced vowel, **not mutually contrastive in that position**, may appear. ...
www.helsinki.fi/~tasalmin/sketch.html

**NOTE: I include this last reference because it's from the first mentor I had at Georgetown, before I switched out of theoretical linguistics. I took 5 courses from him. He taught me how to study! **

.. attention to the units of sound, the units of meaning, the units of grammar, and their **mutually contrastive arrangement patterns** / $c by Walter A. Cook. ...
ling.lll.hawaii.edu/faculty/stampe/AA/AA-BIB/mundari.marc