kupu+kupu kupu+kupu
kupu kupu kupu kupu .
k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY
k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY k u p u WORD_BOUNDARY . WORD_BOUNDARY