segmentation: 3 hot words
rank.candidate: 3ho t words 3 ho two rd s 3 hot wo rds 3hotwor ds 3 hot wor ds 3 hot word s 3 hot words 3hotwo rds 3 hotwords 3 hotw ords 3 hot w or ds 3 hot w ords 3 ho two rds 3 hotword s 3 ho t words 3hot words 3h ot words 3hotw ords 3hotword s 3h otwords