#include <iostream>
#include <vector>
using namespace std;
int main(){
int T;
cin>>T;
int x1[100],y1[100],x2[100],y2[100];
vector<int> sum;
while(T>0){
int s1=0;
int n;
cin>>n;
for(int i=0;i<n;i++){
cin>>x1[i]>>y1[i]>>x2[i]>>y2[i];
int s=(x2[i]-x1[i]+1)*(y2[i]-y1[i]+1);
s1+=s;
}
sum.push_back(s1);
T--;
}
for(int i=0;i<sum.size();i++){
cout<<sum[i]<<endl;
}
return 0;
}
#include <vector>
using namespace std;
int main(){
int T;
cin>>T;
int x1[100],y1[100],x2[100],y2[100];
vector<int> sum;
while(T>0){
int s1=0;
int n;
cin>>n;
for(int i=0;i<n;i++){
cin>>x1[i]>>y1[i]>>x2[i]>>y2[i];
int s=(x2[i]-x1[i]+1)*(y2[i]-y1[i]+1);
s1+=s;
}
sum.push_back(s1);
T--;
}
for(int i=0;i<sum.size();i++){
cout<<sum[i]<<endl;
}
return 0;
}