ba ba ba ba ba ba
ba ba ba ba ba ba .
b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY
b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY b a WORD_BOUNDARY . WORD_BOUNDARY