package main

import (
	"bufio"
	"container/heap"
	"fmt"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	t := getNextInt(scanner)
	for i := 0; i < t; i++ {
		testcase(scanner, writer)
	}
}
func testcase(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	m := map[int]int{}
	for i := 0; i < n; i++ {
		l := getNextInt(scanner)
		m[l]++
	}
	bb := &bamboo{}
	for _, c := range m {
		heap.Push(bb, c)
	}
	var ans int
	for bb.Len() >= 3 {
		ans++
		b1 := heap.Pop(bb).(int)
		b2 := heap.Pop(bb).(int)
		b3 := heap.Pop(bb).(int)
		b1--
		b2--
		b3--
		if b1 > 0 {
			heap.Push(bb, b1)
		}
		if b2 > 0 {
			heap.Push(bb, b2)
		}
		if b3 > 0 {
			heap.Push(bb, b3)
		}
	}
	fmt.Fprintln(writer, ans)
}

type bamboo []int

func (h bamboo) Len() int { return len(h) }
func (h bamboo) Less(i, j int) bool {
	return h[i] > h[j]
}
func (h bamboo) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
func (h *bamboo) Push(x interface{}) {
	*h = append(*h, x.(int))
}
func (h *bamboo) Pop() interface{} {
	old := *h
	n := len(old)
	x := old[n-1]
	*h = old[0 : n-1]
	return x
}