from collections import Counter
import heapq

t=int(input())
for tests in range(t):
    N=int(input())
    A=list(map(int,input().split()))

    C=Counter(A)
    H=list(C.values())

    H=[-h for h in H]
    heapq.heapify(H)

    ANS=0

    while len(H)>=3:
        x=heapq.heappop(H)
        y=heapq.heappop(H)
        z=heapq.heappop(H)

        x+=1
        y+=1
        z+=1
        ANS+=1

        if x!=0:
            heapq.heappush(H,x)
        if y!=0:
            heapq.heappush(H,y)
        if z!=0:
            heapq.heappush(H,z)
    print(ANS)