let x = y z = w in x let x = y z = w in x a = let x = y z = w in x a = let x = y z = w in x let x = y z = w in x let z = w in x a = let z = w in x a = let z = w in x f x = let g x = 5 g x = 5 in 3 f = let y = z in z f x = let y = z in z