Fee is related to Expense. Expense is related to Bill. Bill is related to President. President is a synonym of Chairman. 
Class is related to Board. Board entails/necessarily involves Feed. Feed is related to Animal. Animal is part of Ecosystem. 
Fee <--RelatedTo--> Expense <--RelatedTo--> Bill <--RelatedTo--> President <--Synonym--> Chairman 
Class <--RelatedTo--> Board --Entails--> Feed <--RelatedTo--> Animal --PartOf--> Ecosystem 