but but aa3 but but
but but aa3 but but
on on fil on on
but but aa3 but but .
 WORD_BOUNDARY  WORD_BOUNDARY a˧ WORD_BOUNDARY  WORD_BOUNDARY  WORD_BOUNDARY
b u t WORD_BOUNDARY b u t WORD_BOUNDARY a a 3 WORD_BOUNDARY b u t WORD_BOUNDARY b u t WORD_BOUNDARY . WORD_BOUNDARY