di buku di buku di buku
di buku di buku di buku .
d i WORD_BOUNDARY b u k u WORD_BOUNDARY d i WORD_BOUNDARY b u k u WORD_BOUNDARY d i WORD_BOUNDARY b u k u WORD_BOUNDARY
d i WORD_BOUNDARY b u k u WORD_BOUNDARY d i WORD_BOUNDARY b u k u WORD_BOUNDARY d i WORD_BOUNDARY b u k u WORD_BOUNDARY . WORD_BOUNDARY