Call is related to Collar. Collar is related to Bell. Bell is related to Angel. 
Chinese is a type of Person. User is a type of Person. User is related to Profile. Profile is a different concept from Back. 
Call <--RelatedTo--> Collar <--RelatedTo--> Bell <--RelatedTo--> Angel 
Chinese --IsA--> Person <--IsA-- User <--RelatedTo--> Profile <--DistinctFrom--> Back 