tu wi ba ba ba ba
tu wi ba ba ba ba .
t u WORD_BOUNDARY w i WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY
t u WORD_BOUNDARY w i WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY . WORD_BOUNDARY