you are likely to find Rat in/at/on Laboratory. Rat is a type of Pad. you are likely to find Pad in/at/on Store. Store is a synonym of Write. 
Key is related to Minor. Minor is related to Musical. 
Laboratory <--AtLocation-- Rat --IsA--> Pad --AtLocation--> Store <--Synonym--> Write 
Key <--RelatedTo--> Minor <--RelatedTo--> Musical 