Extension is a type of Telephone. Extension is a type of Dance. Heel is a type of Dance. Heel is related to Rear. 
Identity is related to Nation. Nation is related to Leadership. Leadership is related to Administration. Executive is a type of Administration. 
Telephone <--IsA-- Extension --IsA--> Dance <--IsA-- Heel <--RelatedTo--> Rear 
Identity <--RelatedTo--> Nation <--RelatedTo--> Leadership <--RelatedTo--> Administration <--IsA-- Executive 