tu tum pa pa pa
tu tum pa pa pa .
t̪ u WORD_BOUNDARY t̪ u m WORD_BOUNDARY p a WORD_BOUNDARY p a WORD_BOUNDARY p a WORD_BOUNDARY
t u WORD_BOUNDARY t u m WORD_BOUNDARY p a WORD_BOUNDARY p a WORD_BOUNDARY p a WORD_BOUNDARY . WORD_BOUNDARY