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)
    kadomatu = int(N) // 3
    for i in range(len(count_l)):
        count_l[i] = min(count_l[i],kadomatu)
    new_kadomatu = sum(count_l) // 3
    print(new_kadomatu)