A dead pixel

import java.util.Scanner;


public class Main {

     public static int getM(int i,int j,int k,int l)
    {
        int num[]={i,j,k,l};
       int large=num[0];

       for(int u=0;u<num.length;u++)
       {

           if(large<num[u]) large=num[u];
       }
       return large;
    }
      public static int getLarge(int a,int b,int x,int y)
    {
        if(a+b!=2)
        {
       int area=y*a;
       int area2=(b-(y+1))*a;
       int area3=x*b;
       int area4=(a-(x+1))*b;

       return (getM(area, area2, area3, area4));
        }
        else{
             return -1;
        }
}
    public static void main(String[] args) {

         int[][] a=new int[1000][1000];
       int[] b= new int[1000];
        Scanner sc=new Scanner(System.in);

         int xx=sc.nextInt();
        int o;
        for(int j=0;j<4;j++)
        { for(int i=0;i<xx;i++)
        {
             a[i][0]=sc.nextInt();
             a[i][1]=sc.nextInt();
             a[i][2]=sc.nextInt();
             a[i][3]=sc.nextInt();
             if(a[i][2]>=0 && a[i][2]<a[i][0] && a[i][3]>=0 && a[i][3]<a[i][1] && a[i][0]+a[i][1]!=2)
             {
             b[i]=getLarge(a[i][0], a[i][1], a[i][2], a[i][3]);

             }
             else{
                  System.out.println("Error");
                  b[i]=-1;
             }
        }
            for(int k=0;k<xx;k++)
            {
                if(b[k]!=-1)
                {
                System.out.println(b[k]);
                }
            }
        }
    }
}