from heapq import heapify,heappop,heappush
from collections import defaultdict

T=int(input())
Ans=[]

for _ in range(T):
    N=int(input())
    L=list(map(int,input().split()))

    D=defaultdict(int)
    for a in L:
        D[a]+=1

    Q=[-k for k in D.values()]
    heapify(Q)

    X=0
    while len(Q)>=3:
        p=-heappop(Q)
        q=-heappop(Q)
        r=-heappop(Q)

        X+=1
        for x in [p,q,r]:
            if x>1:
                heappush(Q,-(x-1))

    Ans.append(X)

print(*Ans,sep="\n")