using System;
using System.IO;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Collections.Generic;
using Enu = System.Linq.Enumerable;

class Program
{
    void Solve()
    {
        int T = reader.Int();
        var ans = new List<int>();

        for (int t = 0; t < T; t++)
        {
            int N = reader.Int();
            var L = reader.IntArray(N);
            ans.Add(Count(L));
        }

        Console.WriteLine(string.Join("\n", ans));
    }

    private int Count(int[] L)
    {
        var sorted = L.OrderBy(x => x).ToArray();
        var distinct = sorted.Distinct().ToArray();
        int N = distinct.Length;
        int[] rem = new int[N];
        Array.ForEach(sorted, len => rem[Array.BinarySearch(distinct, len)]++);
        int res = 0;

        while (N >= 3)
        {
            Array.Sort(rem);
            if (rem[N - 3] == 0) break;
            res++;
            rem[N - 1]--; rem[N - 2]--; rem[N - 3]--;
        }

        return res;
    }




    static void Main() { new Program().Solve(); }
    Reader reader = new Reader(Console.In);
    class Reader
    {
        private readonly TextReader reader;
        private readonly char[] separator = { ' ' };
        private readonly StringSplitOptions removeOp = StringSplitOptions.RemoveEmptyEntries;
        private string[] A = new string[0];
        private int i;

        public Reader(TextReader r) { reader = r; }
        public bool HasNext() { return Enqueue(); }
        public string String() { return Dequeue(); }
        public int Int() { return int.Parse(Dequeue()); }
        public long Long() { return long.Parse(Dequeue()); }
        public double Double() { return double.Parse(Dequeue()); }
        public int[] IntLine() { var s = Line(); return s == "" ? new int[0] : Array.ConvertAll(Split(s), int.Parse); }
        public int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
        public int[][] IntGrid(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
        public string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
        public string Line() { return reader.ReadLine().Trim(); }
        private string[] Split(string s) { return s.Split(separator, removeOp); }
        private bool Enqueue()
        {
            if (i < A.Length) return true;
            string line = reader.ReadLine();
            if (line == null) return false;
            if (line == "") return Enqueue();
            A = Split(line);
            i = 0;
            return true;
        }
        private string Dequeue() { Enqueue(); return A[i++]; }
    }
}