#include<cstdio>
#include<iostream>
#include<iomanip>
#include<map>
#include<string>
#include<queue>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<cstdlib> 
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define endl "\n"
#define int long long
using namespace std;

    typedef long long ll;
    const int inf=0x3f3f3f3f;
    const int maxn=1010;
    const int maxe=20010;
    int n,m,k;
    void solve(){
        int x1,x2;
        cin>>n>>m>>x1>>x2;
        int ans;
        if(n%2==0)
            ans=(n-1)/2+(abs(x2-x1)/2);
        else
            ans=(n-1)/2+(abs(abs(x2-x1)-1)/2);
        if(m%2==0)
            ans=min(ans,(m-1)/2+(n-1)/2);
        else
            ans=min(ans,(m-1)/2+(n-2)/2);
        ans=min(ans,x1-1);
        ans=min(ans,m-x2);
        ans=min(ans,n-1);
        cout<<ans*ans<<endl;
    }
    signed main(){
        IOS
        #ifndef ONLINE_JUDGE
            freopen("IO\\in.txt","r",stdin);
            freopen("IO\\out.txt","w",stdout);
        #endif
        int tn=1;
        cin>>tn;
        while(tn--){
            solve();
        }
    }