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