bira bira bira bira
bira bira bira bira .
b i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY
b i r a WORD_BOUNDARY b i r a WORD_BOUNDARY b i r a WORD_BOUNDARY b i r a WORD_BOUNDARY . WORD_BOUNDARY