Modest is similar to Decent. Decent is related to Clean. Clean is related to Wipe. Sweep is a type of Wipe. 
Controversy is related to Oil. Oil is related to Valuable. 
Modest <--SimilarTo--> Decent <--RelatedTo--> Clean <--RelatedTo--> Wipe <--IsA-- Sweep 
Controversy <--RelatedTo--> Oil <--RelatedTo--> Valuable 