from collections import Counter
from heapq import heapify as hpi , heappop as hpop , heappush as hpush

t=int(input())

for i in range(t):
    n=int(input())
    a=list(map(int,input().split()))
    c=[-i for i in Counter(a).values()]
    hpi(c)
    cnt=0
    while len(c) >= 3:
        x=hpop(c)+1
        y=hpop(c)+1
        z=hpop(c)+1

        for i in [x,y,z]:
            if i != 0:
                hpush(c,i)
        cnt+=1
        
    print(cnt)