a bira bira bira bira
a bira bira bira bira .
a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY β i ɾ a WORD_BOUNDARY
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