segmentation: windows 7
rank.candidate: w in dows 7 window s 7 wi ndows7 wi nd ows 7 w indows 7 win do ws 7 window s7 windo ws 7 wi ndows 7 wind ows 7 wind ows7 wind ow s 7 windows7 w indo ws 7 w indows7 windows 7 win do ws7 win dow s 7 win dows 7 win dows7