i1 i2 i2 i2 i2 i2
i1 i2 i2 i2 i2 i2
co co co co co co
i1 i2 i2 i2 i2 i2 .
i˥ WORD_BOUNDARY i˨˥ WORD_BOUNDARY i˨˥ WORD_BOUNDARY i˨˥ WORD_BOUNDARY i˨˥ WORD_BOUNDARY i˨˥ WORD_BOUNDARY
i 1 WORD_BOUNDARY i 2 WORD_BOUNDARY i 2 WORD_BOUNDARY i 2 WORD_BOUNDARY i 2 WORD_BOUNDARY i 2 WORD_BOUNDARY . WORD_BOUNDARY