src/contraint/common.py

MONOPHTHONGS = ['a', 'æ', 'e', 'ɛ', 'i', 'ɪ', 'o', 'ɔ', 'u', 'ʊ', 'ə', 'ɑ', 'ʌ']
DIPHTHONGS = ['aɪ', 'aʊ', 'ɔɪ', 'eɪ', 'oʊ']