on c'est o n
on être o n
test v:exist n:let n:let
on c'est o n .
ɔ̃ WORD_BOUNDARY s ɛ WORD_BOUNDARY  o WORD_BOUNDARY  ɛ n WORD_BOUNDARY
o n WORD_BOUNDARY c ' e s t WORD_BOUNDARY o WORD_BOUNDARY n WORD_BOUNDARY