from collections import defaultdict
from heapq import heappop, heappush
T = int(input())
ansl = []
for i in range(T):
    N = int(input())
    L = list(map(int, input().split()))
    d = defaultdict(int)
    for l in L:
        d[l] += 1

    cnt = []
    for k, v in d.items():
        heappush(cnt, -v)

    # 3つ取る
    ans = 0
    if len(cnt) < 3:
        ansl.append(0)
        continue

    while len(cnt) >= 3:
        memo = []
        for i in range(3):
            num = heappop(cnt)
            num += 1
            if num != 0:
                memo.append(num)
        # 3回まわしてから、pushする
        for num in memo:
            heappush(cnt, num)
        else:
            ans += 1

    ansl.append(ans)

print(*ansl, sep='\n')