Serving is related to Pour. Pour is related to Transfer. Mail is a type of Transfer. Mail is related to Service. 
Queen is related to Husband. Husband is related to Married. Married is related to Ring. Toll is a type of Ring. 
Serving <--RelatedTo--> Pour <--RelatedTo--> Transfer <--IsA-- Mail <--RelatedTo--> Service 
Queen <--RelatedTo--> Husband <--RelatedTo--> Married <--RelatedTo--> Ring <--IsA-- Toll 