/*
TTTTTTTTT    h       h    eeeeeeeee    BBBBBBBBB        aaaa         dddddddd      rrrrrrrr     iiiiiiii      X       X
    T        h       h    e            B        B      a    a        d       d     r       r       ii          X     X
    T        h       h    e            B        B     a      a       d        d    r       r       ii           X   X
    T        hhhhhhhhh    eeeeeeeee    BBBBBBBBB     aaaaaaaaaa      d        d    rrrrrrrrr       ii             X
    T        h       h    e            B        B   a          a     d        d    rr rr           ii           X  X
    T        h       h    e            B        B   a          a     d       d     rr   rr         ii          X    X
    T        h       h    eeeeeeeee    BBBBBBBBB    a          a     dddddddd      rr    rr     iiiiiiii      X      X
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
/*
- Give yourself 40 Minutes **of being stuck** before reading editorial
- if you need the editorial, read it bit-by-bit and process it
- code the solution once you understand it
- Note down what are you doing/thinking of as you do it
 */
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(nullptr);
    int tt;cin>>tt;
    while(tt--)
    {
        int x1=-10000,y1=-10000,x2=10000,y2=10000;
        int n;cin>>n;
        while(n--)
        {
            int a,b,c,d;cin>>a>>b>>c>>d;
            x1=max(x1,a);
            y1=max(y1,b);
            x2=min(x2,c);
            y2=min(y2,d);
        }
        ll ans=0;
        if(x1<x2 && y1<y2) ans=(x2-x1)*(y2-y1);
        cout<<"Case #1: "<<ans<<endl;
    }
}
// "Failure is another stepping stone to greatness."
// It's fine to celebrate success, but it is more important to heed the lessons of failure.
//“Competition is the fuel that ignites innovation.”

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