#include <bits/stdc++.h>
using namespace std;
int gcd(int a, int b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
int main() {
  int t;
  cin >> t;
  for (int testc = 0; testc < t; testc++) {
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << max(a + b, d + c) << "\n";
  }
}
