Elementary is related to School. you are likely to find School in/at/on City. 
you are likely to find Couch in/at/on House. Couch is related to Mechanism. Mechanism is a type of Device. Pick is a type of Device. 
Elementary <--RelatedTo--> School --AtLocation--> City 
House <--AtLocation-- Couch <--RelatedTo--> Mechanism --IsA--> Device <--IsA-- Pick 