import sys
from collections import Counter
readline=sys.stdin.readline

def Bisect_Int(ok,ng,is_ok):
    while abs(ok-ng)>1:
        mid=(ok+ng)//2
        if is_ok(mid):
            ok=mid
        else:
            ng=mid
    return ok
T=int(readline())
for t in range(T):
    N=int(readline())
    L=list(map(int,readline().split()))
    C=Counter(L)
    def is_ok(ans):
        cnt=0
        for l,c in C.items():
            cnt+=min(c,ans)
        return ans*3<=cnt
    ans=Bisect_Int(0,1<<30,is_ok)
    print(ans)