mnnmnnmnnmnnmnnmnnmnn pupupupupupupupupupu
mnnmnnmnnmnnmnnmnnmnn pupupupupupupupupupu
wp wp
mnnmnnmnnmnnmnnmnnmnn pupupupupupupupupupu .
m n n m n n m n n m n n m n n m n n m n n WORD_BOUNDARY p u p u p u p u p u p u p u p u p u p u WORD_BOUNDARY
m n n m n n m n n m n n m n n m n n m n n WORD_BOUNDARY p u p u p u p u p u p u p u p u p u p u WORD_BOUNDARY . WORD_BOUNDARY