# -*- coding: utf-8 -*-
from collections import Counter

T = int(raw_input())

for i in xrange(T):
    N = int(raw_input())
    L = map(int, raw_input().split())

    counter = Counter()
    for l in L:
        counter[l] += 1

    M = []
    for cnt in counter:
        M.append(counter[cnt])

    count = 0
    while 1:
        M.sort(reverse=True)
        if len(M)<3:
            break
        if M[0] > 0 and M[1] > 0 and M[2] > 0:
            M[0] -= 1
            M[1] -= 1
            M[2] -= 1
            count += 1
        else:
            break
    print count