Conservation is a type of Principle. Principle is a type of Value. Premium is a type of Value. 
Fork can be used for Eat. Eat is a synonym of Have. Have is related to Contain. Contain is a synonym of Restrict. 
Conservation --IsA--> Principle --IsA--> Value <--IsA-- Premium 
Fork --UsedFor--> Eat <--Synonym--> Have <--RelatedTo--> Contain <--Synonym--> Restrict 