Curve is related to Twist. Twist is related to Shake. Fan is a type of Shake. Fan is related to System. 
Dancing is related to Bear. Bear is related to Prevent. 
Curve <--RelatedTo--> Twist <--RelatedTo--> Shake <--IsA-- Fan <--RelatedTo--> System 
Dancing <--RelatedTo--> Bear <--RelatedTo--> Prevent 