Bay is a type of Cry. Cry is a type of Want. 
Heat is a different concept from Light. you are likely to find Light in/at/on Porch. Deck is a type of Porch. Deck is a type of Be. 
Bay --IsA--> Cry --IsA--> Want 
Heat <--DistinctFrom--> Light --AtLocation--> Porch <--IsA-- Deck --IsA--> Be 