let x = 4+5 in 2*x;;
x;;
let x = 17;;
x;;
let y = x+1 in y/3;;

let x = 4 in
let y = x+1 in
let x = 2*y in x;;

let x = 4 in
(let x = 17 in x+1) + x;;

let x = 4+5 in 2*x;;
x;;
let x = 17;;
x;;
let y = x+1 in y/3;;

let x = 4 in
let y = x+1 in
let x = 2*y in x;;

let x = 4 in
(let x = 17 in x+1) + x;;
