Stage is related to Flat. Flat is related to Apartment. you are likely to find Potato in/at/on Apartment. 
Commissioner is a type of Administrator. Commissioner is derived from Commission. Commission is a synonym of Instruct. 
Stage <--RelatedTo--> Flat <--RelatedTo--> Apartment <--AtLocation-- Potato 
Administrator <--IsA-- Commissioner --DerivedFrom--> Commission <--Synonym--> Instruct 