Here's an old puzzle: Baker, Cooper, Fletcher, Miller and Smith live on different floors of an apartment house that contains only five floors. Baker does not live on the top floor. Cooper does not live on the bottom floor. Fletcher does not live on either the top or the bottom floor. Miller lives on a higher floor than does Cooper. Smith does not live on a floor adjacent to Fletcher's. Fletcher does not live on a floor adjacent to Cooper's. Where does everyone live? The function apartment_puzzle() should return a list of five floor numbers, each 1 through 5, denoting the floor of Baker, Cooper, Fletcher, Miller and Smith.