from collections import Counter
from heapq import *

T = int(input())
for t in range(T):
    N = int(input())
    L = list(map(int, input().split()))
    H = []
    heapify(H)
    counted = Counter(L)
    for n in counted:
        heappush(H, (-counted[n], n))

    count = 0
    while len(H) >= 3:
        count += 1
        c1, n1 = heappop(H)
        c2, n2 = heappop(H)
        c3, n3 = heappop(H)
        if c1 < -1:
            heappush(H, (c1+1, n1))
        if c2 < -1:
            heappush(H, (c2+1, n2))    
        if c3 < -1:
            heappush(H, (c3+1, n3))    
        #print(H)
    print(count)