#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL);
  long long int t;
  cin >> t;
  while (t--) {
    long long int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << max(a + b, c + d) << "\n";
  }
  return 0;
}
