Source is related to Free. Free is a different concept from Expensive. 
Sign is related to Speed. Speed is related to Rapid. Rapid is related to Race. Race is related to Athletic. 
Source <--RelatedTo--> Free <--DistinctFrom--> Expensive 
Sign <--RelatedTo--> Speed <--RelatedTo--> Rapid <--RelatedTo--> Race <--RelatedTo--> Athletic 