#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    int t;
    cin >> t;

    while(--t >= 0){
        int n;
        cin >> n;

        map<int, int> cnt;
        for(int i=0; i<n; ++i){
            int len;
            cin >> len;
            ++ cnt[len];
        }

        int maxCnt = 0;
        for(auto p : cnt)
            maxCnt = max(maxCnt, p.second);

        int ret = min(n / 3, (n - maxCnt) / 2);
        cout << ret << endl;
    }

    return 0;
}