B A ba ba T U tu tu
b a ba ba t u tu tu .
b WORD_BOUNDARY a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY t WORD_BOUNDARY u WORD_BOUNDARY t u WORD_BOUNDARY t u WORD_BOUNDARY
b WORD_BOUNDARY a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY t WORD_BOUNDARY u WORD_BOUNDARY t u WORD_BOUNDARY t u WORD_BOUNDARY . WORD_BOUNDARY