bum+bum ni bum+bum
bum bum ni bum bum .
b u m WORD_BOUNDARY b u m WORD_BOUNDARY n i WORD_BOUNDARY b u m WORD_BOUNDARY b u m WORD_BOUNDARY
b u m WORD_BOUNDARY b u m WORD_BOUNDARY n i WORD_BOUNDARY b u m WORD_BOUNDARY b u m WORD_BOUNDARY . WORD_BOUNDARY