data FridgeObject = UndefinedA
  deriving Show

applesA :: FridgeObject
applesA = undefined

milkB :: FridgeObject
milkB = undefined

lemonsC :: FridgeObject
lemonsC = undefined


data FridgeList = UndefinedB
  deriving Show

exampleFridgeList :: FridgeList
exampleFridgeList = undefined