Destination is related to Bar. Bar is related to Steel. you are likely to find Steel in/at/on Hospital. 
Oil is related to Corn. you are likely to find Corn in/at/on Shop. Shopping is a form of Shop. Shopping is related to Sale. 
Destination <--RelatedTo--> Bar <--RelatedTo--> Steel --AtLocation--> Hospital 
Oil <--RelatedTo--> Corn --AtLocation--> Shop <--FormOf-- Shopping <--RelatedTo--> Sale 