Problem: What are the most important words?
how did horses and traders change the way of life of ethnicity in fiction
Answer: ethnicity, fiction, life, way

Problem: What are the most important words?
ethnicity reading religious text and praying
Answer: ethnicity, read, text

Problem: What are the most important words?
asphalt road through the green field and clouds on blue sky in summer day
Answer:
day, field, road