a_ver ven ven ven
a ver ven ven ven .
a WORD_BOUNDARY β e ɾ WORD_BOUNDARY β e m WORD_BOUNDARY b e m WORD_BOUNDARY b e n WORD_BOUNDARY
a WORD_BOUNDARY v e r WORD_BOUNDARY v e n WORD_BOUNDARY v e n WORD_BOUNDARY v e n WORD_BOUNDARY