#include<iostream>
using namespace std;
int main(){
    int t;
    long long x1,x2,y1,y2;
    cin>>t;
    while(t--){
        cin>>x1>>y1>>x2>>y2;
        if(abs(abs(x1-x2)-abs(y1-y2))<=1)
            cout<<abs(x1-x2)+abs(y1-y2)<<endl;
        else{
            cout<<abs(x1-x2)+abs(y1-y2)+(abs(abs(x1-x2)-abs(y1-y2))-1)*2<<endl;
        }
    }
}