Problem: What are the most important words?
pattern in the shape of circle .
Answer: circle, pattern, shape

Problem: What are the most important words?
armed force deployed in support of event provided members of a class
Answer: event, force, provide, support

Problem: What are the most important words?
small hut or log cabin at the cliff edge near icy pond in white snowy forest in winter
Answer:
edge, forest, log, pond, winter