District is a type of Film. Apartment is a type of Film. you are likely to find Carpet in/at/on Apartment. you are likely to find Dust in/at/on Carpet. 
you are likely to find Sauce in/at/on Plate. Plate is related to Cooking. Cooking can cause/lead to Pride. 
District --IsA--> Film <--IsA-- Apartment <--AtLocation-- Carpet <--AtLocation-- Dust 
Sauce --AtLocation--> Plate <--RelatedTo--> Cooking --Causes--> Pride 