#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define MAX 10
using ill = int64_t;
using ull = uint64_t;
using namespace std;

void solve() {
  int n;
  cin >> n;
  int items[10]{0};

  rep(i, n) {
    rep(j, 3) {
      int idx;
      cin >> idx;
      items[idx - 1]++;
    }
  }

  int power_up = 0;
  rep(i, n) {
    if (items[i] >= 2) {
      power_up += items[i] / 2;
      items[i] %= 2;
    }
  }

  int rest = 0;
  rep(i, 10) rest += items[i];
  power_up += rest / 4;

  cout << power_up << '\n';
}

void wrapper() {
  int loop;
  cin >> loop;
  rep(i, loop) {
    cout << "[TEST " << i + 1 << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}