import sys
from collections import Counter

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def solve():
    T = int(input())

    for i in range(T):
        N = int(input())
        Ls = [int(i) for i in input().split()]
        cnt = Counter(Ls)
        ans = 0

        while len(cnt) >= 3:
            ans += 1
            kdmt = [key for key, value in cnt.most_common(3)]
            for i in kdmt:
                cnt[i] -= 1
                if cnt[i] == 0:
                    del cnt[i]

        print(ans)

if __name__ == '__main__':
    solve()