#include <math.h>
#include <stdio.h>
#define MAX(a,b)(a>=b?a:b)
#define MIN(a,b)(a<=b?a:b)
int main()
{
    int i,n,x1,x3,x5,x7,y1,y3,y5,y7,f,t,j;
    long int area;
    scanf("%d",&t);
    for (j=1; j<=t; j++){
    scanf("%d",&n);
    f=1;
    scanf("%d%d%d%d",&x1,&y1,&x3,&y3);
    if ((x1==x3) && (y1==y3)) f=0;
    else if ((y1>y3) || (x1>x3)) f=0;
    for (i=2; i<=n; i++)
    {
        scanf("%d%d%d%d",&x5,&y5,&x7,&y7);
        if((y5>y7) || (x5>x7)) f=0;
        if (f==1){
        if ((x5==x7) && (y5==y7)) f=0;
        else if((x5>=x3) || (x7<=x1) || (y5>=y3) || (y1>=y7)) f=0;
        x1=MAX(x1,x5);
        y1=MAX(y1,y5);
        x3=MIN(x3,x7);
        y3=MIN(y3,y7);
        }
        }
    if (f) area=(long int)((((x1-x3)*(x1-x3))+((y1-y3)*(y1-y3)))*.5);
    else area=0;
    printf("Case %d: %ld\n",j,area);
    }
    return 0;
}