//翻牌的那道题，做出来了，不知道对不对 //没来得及提交，帮忙看看呗 import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int count = sc.nextInt(); int []re = new int[count]; for(int i = 0;i<count;i++){ int n = sc.nextInt(); int m = sc.nextInt(); if(n>m){ int tmp =m; m =n; n = tmp; } int r = 0; if(n>=3&&m>=3){ r =n*m -2*(n+m-2); } else if(n==1){ if(m ==1){ r=1; } if(m == 2){ r=0; } if(m>=3) { r = m-2; } }else if(n ==2){ r= 0; } re[i] =r; } for(int i =0;i<count;i++){ System.out.println(re[i]); } } }