let mutable y1 = 1
let _ = y1 <- y1*2 in
let _ = y1 <- y1+1 in
let _ = y1 <- y1+1 in

printf "y1 = %A\n"y1

let mutable x1 = 1
let _ = x1 <- x1+1 in
let _ = x1 <- x1*2 in
let _ = x1 <- x1+1 in

printf "x1 = %A\n"x1

let mutable y = 1
y <- y * 2
y <- y + 1
y <- y + 1


printf "y = %A\n"y

let mutable x = 1
x <- x + 1
x <- x * 2
x <- x + 1


printf "x = %A\n"x