#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll solve(){
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    ll ans = 0;
    if(c < d){
        swap(a, b);
        swap(c, d);
    }
    if(a > c){
        a = 0;
        ans++;
    }
    //b -> c + 1 -> 0
    //b -> 2以上 -> 0
    if((a < b && b <= c) || b > d){
        ans += 1 + (b == 1 && a == 0);
        b = 0;
    }
    ans += c - a + d - b;
    return ans;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    while(T--){
        cout << solve() << '\n';
    }
}