from heapq import heapify
from collections import defaultdict

T=int(input())

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

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

    Q=list(D.keys())
    heapify(Q)

    X=0
    while len(Q)>=3:
        p=Q.pop()
        q=Q.pop()
        r=Q.pop()

        X+=1

        for x in [p,q,r]:
            D[x]-=1
            if D[x]>=1:
                Q.append(x)

    print(X)