Coal is related to Carbon. Carbon is related to Gas. Gas is a different concept from Liquid. Liquid is similar to Musical. 
Power is related to Super. Super is related to Hero. 
Coal <--RelatedTo--> Carbon <--RelatedTo--> Gas <--DistinctFrom--> Liquid <--SimilarTo--> Musical 
Power <--RelatedTo--> Super <--RelatedTo--> Hero 