#include <iostream>
using namespace std;
int main(int argc, char** argv) {
    int T;
    cin >> T;
    while(T--)
    {
        long long n,m,x,y;
        cin >> n >> m >> x >> y;
        long long ans=1e18;
        ans=min(ans,x-1);
        ans=min(ans,m-y);
        ans=min(ans,n-1);
        ans=min(ans,(max(1ll,max(x,y)-min(x,y))+(n-1)-1)/2);
        cout << ans*ans << "\n";
    }
    return 0;
}