Problem: What are the most important words?
actor in conversation with comedian as he signs copies of his new book at bookstore .
Answer: book, bookstore, copy, sign

Problem: What are the most important words?
football player greets the honorary president and stadium during the christmas lunch .
Answer: greet, player, president

Problem: What are the most important words?
automobile model climbs down from a hill in the cobbled streets
Answer:
cobble, model, street