Free is a synonym of Liberal. Liberal is similar to Moderate. Moderate is similar to Conservative. 
Question is related to Propose. Propose is a synonym of Present. Present is related to Tree. 
Free <--Synonym--> Liberal <--SimilarTo--> Moderate <--SimilarTo--> Conservative 
Question <--RelatedTo--> Propose <--Synonym--> Present <--RelatedTo--> Tree 