Little is related to Drop. Dump is a type of Drop. Dump is a type of Sell. Sell is related to Rent. 
Ad is related to Uncertainty. Uncertainty is a different concept from Sure. Sure is similar to Steady. 
Little <--RelatedTo--> Drop <--IsA-- Dump --IsA--> Sell <--RelatedTo--> Rent 
Ad <--RelatedTo--> Uncertainty <--DistinctFrom--> Sure <--SimilarTo--> Steady 