Carrier is related to Bag. Bag can cause/lead to Travel. Wheel is a type of Travel. Wheel is a synonym of Rack. 
Policeman is related to Detective. Detective is a type of Worker. Contractor is a type of Worker. Contractor is a type of Builder. 
Carrier <--RelatedTo--> Bag --Causes--> Travel <--IsA-- Wheel <--Synonym--> Rack 
Policeman <--RelatedTo--> Detective --IsA--> Worker <--IsA-- Contractor --IsA--> Builder 