you are likely to find Mouse in/at/on Shelf. Shelf is related to Rack. Rack is related to Rib. 
you are likely to find Pit in/at/on Backyard. you are likely to find Cat in/at/on Backyard. Cat is related to Mouse. 
Mouse --AtLocation--> Shelf <--RelatedTo--> Rack <--RelatedTo--> Rib 
Pit --AtLocation--> Backyard <--AtLocation-- Cat <--RelatedTo--> Mouse 