#include <bits/stdc++.h>
using namespace std;
template <class T>
bool ckmin(T& a, const T& b) {
  return b < a ? a = b, 1 : 0;
}
template <class T>
bool ckmax(T& a, const T& b) {
  return a < b ? a = b, 1 : 0;
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const long double pii = 3.14159265359;
const int MOD = 1000000007;
const char nl = '\n';
const int MX = 200001;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int Test_case;
  cin >> Test_case;
  while (Test_case-- != 0) {
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << max(a + b, c + d) << nl;
  }
  return 0;
}
