T = int(input())

for i in range(T):
    N = input()
    l = list(map(int, input().split()))
    l.sort()
    count_l = []
    count = 1
    for i in range(len(l) - 1):
        if l[i] == l[i + 1]:
            count += 1
        else:
            count_l.append(count)
            count = 1
    count_l.append(count)
    new_kadomatu = int(N) // 3
    while (1):
        flg = 0
        for i in range(len(count_l)):
            if new_kadomatu < count_l[i]:
                flg += 1 
                count_l[i] = new_kadomatu
        new_kadomatu = sum(count_l) // 3
        if flg == 0:
            break
    print(new_kadomatu)