you are likely to find Chain in/at/on Bicycle. you are likely to find Bicycle in/at/on Garage. you are likely to find Dust in/at/on Garage. Dust is related to Ash. 
you are likely to find Rifle in/at/on Pickup. Pickup is a different concept from Drop. 
Chain --AtLocation--> Bicycle --AtLocation--> Garage <--AtLocation-- Dust <--RelatedTo--> Ash 
Rifle --AtLocation--> Pickup <--DistinctFrom--> Drop 