Metal is related to Transition. Transition is a type of Change. Set is a type of Change. Set is related to Limit. 
Bathroom is derived from Bath. Bath is related to Shower. Shower is a type of Party. Contractor is a type of Party. 
Metal <--RelatedTo--> Transition --IsA--> Change <--IsA-- Set <--RelatedTo--> Limit 
Bathroom --DerivedFrom--> Bath <--RelatedTo--> Shower --IsA--> Party <--IsA-- Contractor 