a_ver open and close
a ver open and close !
a WORD_BOUNDARY β e̞ ɾ WORD_BOUNDARY o̞ p e̞ n WORD_BOUNDARY a n d WORD_BOUNDARY k l o̞ s e̞ WORD_BOUNDARY
a WORD_BOUNDARY v e r WORD_BOUNDARY o p e n WORD_BOUNDARY a n d WORD_BOUNDARY c l o s e WORD_BOUNDARY ! WORD_BOUNDARY