a koko koko koko koko
a koko koko koko koko .
a WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY
a WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY k o k o WORD_BOUNDARY