segmentation: road twip
rank.candidate: roadtw ip roa dtwip road twi p ro adtwip r oadtw ip road t wi p roadtwi p roa dt wip roa dtwi p road tw ip r oadt wip road twip ro adtwi p ro ad twip ro adt wip r oadtwi p roadt wip r oadtwip road t wip roadtwip