satu tu dua ada dua
satu tu dua ada dua .
s a t u WORD_BOUNDARY t u WORD_BOUNDARY d u a WORD_BOUNDARY a d a WORD_BOUNDARY d u a WORD_BOUNDARY
s a t u WORD_BOUNDARY t u WORD_BOUNDARY d u a WORD_BOUNDARY a d a WORD_BOUNDARY d u a WORD_BOUNDARY . WORD_BOUNDARY