func square[x: i64] : i64
    return x * x

func sum[a: i64, b: i64] : i64
    return a + b

func main[] : i64
    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
    |> alg.map(^square)
    |> alg.reduce(^sum, 0)
    |> io.println_i64()