#include <bits/stdc++.h>
#define For(i,l,r) for (register int i=l; i<=r; i++)
using namespace std;
typedef unsigned long long LL;
typedef signed long long ll;
template <typename T>
inline void read(T &x) {
    char c = getchar(); int w = 1; x = 0;
    while (!isdigit(c))
        (c == '-') && (w = -w), c = getchar();
    while (isdigit(c))
        x = (x << 1) + (x << 3) + (c ^ '0'), c = getchar();
    x *= w;
}

int T;
signed main() {
    read(T);
    while (T -- > 0) {
        ll n, m, x1, x2;
        read(n); read(m); read(x1); read(x2);
        if (n == 1 || m == 1) {
            puts("0"); continue;
        }
        ll step = min(n-1, min(x1-1, m-x2));
        if (x1 == x2) {
            step = min(step, (n+1)/2-1);
        }
        else step = min(step, (n+abs(x1-x2))/2-1);
//        int q = n+abs(x1-x2);
        step = min(step, max(x1-2, x2-1 + n-2));
        step = min(step, max(m-1-x2, m-x1 + n-2));
        if (step < 0) step = 0;
        printf("%lld\n", step * step);
    }
    getchar();
    return 0;
}