zac zac tac cat cat
zac zac tac cat cat .
dz ɐ k WORD_BOUNDARY dz ɐ k WORD_BOUNDARY t ɐ k WORD_BOUNDARY k ɐ t WORD_BOUNDARY k ɐ t WORD_BOUNDARY
z a c WORD_BOUNDARY z a c WORD_BOUNDARY t a c WORD_BOUNDARY c a t WORD_BOUNDARY c a t WORD_BOUNDARY . WORD_BOUNDARY