mama mama us pus pus
mama mama us pus pus .
m a m a WORD_BOUNDARY m a m a WORD_BOUNDARY u s WORD_BOUNDARY p u s WORD_BOUNDARY p u s WORD_BOUNDARY
m a m a WORD_BOUNDARY m a m a WORD_BOUNDARY u s WORD_BOUNDARY p u s WORD_BOUNDARY p u s WORD_BOUNDARY . WORD_BOUNDARY