buc buc buc bucka
buc buc buc bucka .
b u t̪s WORD_BOUNDARY b u t̪s WORD_BOUNDARY b u t̪s WORD_BOUNDARY b u t̪s k a WORD_BOUNDARY
b u c WORD_BOUNDARY b u c WORD_BOUNDARY b u c WORD_BOUNDARY b u c k a WORD_BOUNDARY . WORD_BOUNDARY