Arm is a type of Limb. Arm can be used for Wave. 
Mountain is related to Pass. Pass is related to Race. Race is related to Athletic. Athletic is related to Gym. 
Limb <--IsA-- Arm --UsedFor--> Wave 
Mountain <--RelatedTo--> Pass <--RelatedTo--> Race <--RelatedTo--> Athletic <--RelatedTo--> Gym 