o ini halo+halo sini sini
o ini halo halo sini sini !
o WORD_BOUNDARY  i n i WORD_BOUNDARY h a l o WORD_BOUNDARY h a l o WORD_BOUNDARY s i n i WORD_BOUNDARY s i n i WORD_BOUNDARY
o WORD_BOUNDARY i n i WORD_BOUNDARY h a l o WORD_BOUNDARY h a l o WORD_BOUNDARY s i n i WORD_BOUNDARY s i n i WORD_BOUNDARY