ay buta buta buta
ay bota bota bota
co v v n
ay buta buta buta .
a i WORD_BOUNDARY β u t a WORD_BOUNDARY β u t a WORD_BOUNDARY β u t a WORD_BOUNDARY
a y WORD_BOUNDARY b u t a WORD_BOUNDARY b u t a WORD_BOUNDARY b u t a WORD_BOUNDARY . WORD_BOUNDARY