Tank is a type of Vessel. Vessel is part of Body. Body is related to Lip. Lip is related to Stiff. 
Bill is related to Law. Law is related to Obligation. 
Tank --IsA--> Vessel --PartOf--> Body <--RelatedTo--> Lip <--RelatedTo--> Stiff 
Bill <--RelatedTo--> Law <--RelatedTo--> Obligation 