#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
  //cin.tie(0);
  //ios::sync_with_stdio(false);
  int q;
  cin>>q;
  for(int i=0;i<q;i++){
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    int ans=0;
    for(int j=a;j<=c;j++){
      for(int k=b;k<=d;k++){
        if(j%2==0||k%2==1)ans++;
      }
    }
    cout<<ans<<endl;
  }
}

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