Ground is related to Park. you are likely to find Cop in/at/on Park. 
Case is related to Job. Job is related to President. President is related to Fool. Fool is a different concept from Smart. 
Ground <--RelatedTo--> Park <--AtLocation-- Cop 
Case <--RelatedTo--> Job <--RelatedTo--> President <--RelatedTo--> Fool <--DistinctFrom--> Smart 