#include<iostream>
using namespace std;


int T;
int x11,x12,y11,y12,x21,x22,y21,y22;

int main(){
    cin>>T;
    while(T--){
        cin>>x11>>y11>>x12>>y12;
        cin>>x21>>y21>>x22>>y22;
        int res = (x12-x11)*(y12-y11);
        res += (x22-x21)*(y22-y21);
        int x31 = x21>?x11;
        int x32 = x22<?x12;
        int y31 = y21>?y11;
        int y32 = y22<?y12;
        res -= ((x32-x31)>?0)*((y32-y31)>?0);
        cout<<res<<endl;
    }
    return 0;
}