o iya Risa yo Risa dulu
o iya risa yo risa dulu .
o WORD_BOUNDARY  i j a WORD_BOUNDARY r i s a WORD_BOUNDARY j o WORD_BOUNDARY r i s a WORD_BOUNDARY d u l u WORD_BOUNDARY
o WORD_BOUNDARY i y a WORD_BOUNDARY r i s a WORD_BOUNDARY y o WORD_BOUNDARY r i s a WORD_BOUNDARY d u l u WORD_BOUNDARY