theorem instBigCoffeeChainIsToParent
theorem instBigCoffeeChainIsToParent: ∀ (x : Type) [BigCoffeeChain.Is x], CoffeeChain.Is x
theorem instBigCoffeeChainIsToParent
theorem instBigCoffeeChainIsToParent: ∀ (x : Type) [BigCoffeeChain.Is x], CoffeeChain.Is x