Commodity is a type of Object. Object is related to Sun. Sun is related to Molecule. Molecule is related to Cell. 
Chair is related to Sir. Sir is related to Title. you are likely to find Title in/at/on Library. Library is related to Rental. 
Commodity --IsA--> Object <--RelatedTo--> Sun <--RelatedTo--> Molecule <--RelatedTo--> Cell 
Chair <--RelatedTo--> Sir <--RelatedTo--> Title --AtLocation--> Library <--RelatedTo--> Rental 