package com.lin;

import java.util.Scanner;

public class 翻转牌 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

    int t = sc.nextInt();
    for (int x = 0; x < t; ++x) {
        int n = sc.nextInt();
        int m = sc.nextInt();
        if (n == 1 && m == 1) {
            System.out.println(1);
        } else if (n == 1 || m == 1) {
            System.out.println(Math.max(n, m) - 2);
        } else {
            System.out.println((n - 2) * (m - 2));
        }
    }

}

}