you are likely to find Shark in/at/on Tank. Shark is related to Big. Big is related to Bed. you are likely to find Female in/at/on Bed. 
Cart is related to Horse. Horse is related to Transport. 
Tank <--AtLocation-- Shark <--RelatedTo--> Big <--RelatedTo--> Bed <--AtLocation-- Female 
Cart <--RelatedTo--> Horse <--RelatedTo--> Transport 