Problem: What are the most important words?
map from which users can select the district in which they want to browse hospitals .
Answer: browse, district, hospital, select, want

Problem: What are the most important words?
coloured headbands for hair and flowers to decorate the hairstyle for little girl
Answer: colour, flower, hair, hairstyle, headband

Problem: What are the most important words?
people moving on escalator and stairs to an underground metro station
Answer:
escalator, stair, station