a_ver introduce a_ver
a ver introduce a ver !
a WORD_BOUNDARY β e̞ ɾ WORD_BOUNDARY i n t ɾ o̞ d u s e̞ WORD_BOUNDARY a WORD_BOUNDARY β e̞ ɾ WORD_BOUNDARY
a WORD_BOUNDARY v e r WORD_BOUNDARY i n t r o d u c e WORD_BOUNDARY a WORD_BOUNDARY v e r WORD_BOUNDARY ! WORD_BOUNDARY