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5 hours ago · Within the UCLA Phonological Segment Inventory Database (UPSID) database of 451 languages, /f/ is attested in 135 languages, and /v/ is attested in 67 languages. In contrast, /ɸ/ and /β/ are attested in only 21 and 32 languages, respectively (Maddieson 1984, p. 45). We note as well the salient visual cues that the learner could take advantage ...