Congress is related to American. American is related to Car. Cab is a type of Car. 
Exercise is a type of Training. Exercise requires Run. Run is related to Sport. Ultimate is a type of Sport. 
Congress <--RelatedTo--> American <--RelatedTo--> Car <--IsA-- Cab 
Training <--IsA-- Exercise --HasPrerequisite--> Run <--RelatedTo--> Sport <--IsA-- Ultimate 