papapa papapa papa papababum
papapa papapa papa papababum
bab bab bab bab
papapa papapa papa papababum .
p a p a p a WORD_BOUNDARY p a p a p a WORD_BOUNDARY p a p a WORD_BOUNDARY p a p a β a β u m WORD_BOUNDARY
p a p a p a WORD_BOUNDARY p a p a p a WORD_BOUNDARY p a p a WORD_BOUNDARY p a p a b a b u m WORD_BOUNDARY . WORD_BOUNDARY