sst sst sst sst sst
sst sst sst sst sst .
s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY
s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY s s t WORD_BOUNDARY . WORD_BOUNDARY