#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
	int t;cin>>t;
	rep(z,t){
		ll a,b,c,d;cin>>a>>b>>c>>d;
		if(a>b)swap(a,b),swap(c,d);
		ll ans=0; if(b>d)ans++,b=0;
		if(a>c||a>b)ans++,a=0;
		ans+=d-b+c-a;
		cout<<ans<<"\n";
	}
}