T = int(input())
#s = [[int(j) for j in input().split()] for i in range(N)]

for i in range(T):
    N = int(input())
    L = [int(i) for i in input().split()]
    amount = sorted([L.count(num) for num in set(L)])
    if len(amount)<3:
        print(0)
        continue
    low = sum(amount[:-2])
    mid = amount[-2]
    high = amount[-1]
    if low<=mid:
        #print("mid")
        print(low)
    else:
        #print("now: low.",low," mid.",mid," high",high)
        low -= mid
        high -= mid
        if low <= high*2:
            #print("high")
            print(mid+low//2)
        else:
            #print("low")
            print(N//3)