#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int solve() {
  int n;
  cin >> n;

  map<int, int> hist;
  REP (i, n) {
    int l;
    cin >> l;
    hist[l]++;
  }

  priority_queue<pair<int, int> > Q;
  for (auto &pr: hist) {
    Q.emplace(pr.second, pr.first);
  }
  
  int ret = 0;
  while (Q.size() >= 3) {
    ++ret;
    vector<pair<int, int> > tmp;
    REP (i, 3) {
      tmp.emplace_back(Q.top());
      Q.pop();
    }
    REP (i, 3) {
      if (--tmp[i].first)
        Q.emplace(tmp[i]);
    }
  }
  
  return ret;
}


int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int T;
  cin >> T;
  REP (i, T)
    cout << solve() << endl;
  
  return 0;
}