Coal is related to Starter. Starter is related to Wood. you are likely to find Screw in/at/on Wood. 
Personal is related to Information. Dream is a type of Information. Dream is a different concept from Nightmare. 
Coal <--RelatedTo--> Starter <--RelatedTo--> Wood <--AtLocation-- Screw 
Personal <--RelatedTo--> Information <--IsA-- Dream <--DistinctFrom--> Nightmare 