#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

ll INF=2e18;

void solve() {
ll A,B,C,D;cin>>A>>B>>C>>D;
ll ans=0;
if(A==C&&B==D){
  cout<<0<<endl;
  return ;
}

if(C<=A&&D<=B) {
if(C!=A) ans+=C+1;
if(B!=D) ans+=D+1;

if(A==C) {
  if(C<D) {
    ans+=1+C;
    if(A==1) ans++;
  }
}

if(B==D) {
  if(D<C) {
    ans+=1+D;
    if(B==1) ans++;
  }
}

}


else if(A<=C&&B<=D) {
  ans+=(D-B)+(C-A);
  if(A<=B&&D<=C) {
    ans+=B+1;
  }
  if(B<=A&&C<=D)  {
    ans+=A+1;
  }
}

else if(C<A) {
  ans+=C+1+(D-B);
  if(D<=C) {
    ans+=B+1;
    if(B==1) ans++;
  }
}

else {
  ans+=(C-A)+D+1;
  if(C<=D) {
    ans+=A+1;
    if(A==1) ans++;
  }
}

cout<<ans<<endl;

  



}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
    ll t;cin>>t;
    for(ll i=0;i<t;i++) {
        solve();
    }
}