#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import array
import collections


def compute_maximum(bamboos):
    answer = 0
    counter = collections.Counter(bamboos)
    if len(counter) < 3:
        return answer
    while True:
        cands = counter.most_common(3)
        if cands[-1][1] <= 0:
            return answer
        used = {x: 1 for x in [cand[0] for cand in cands]}
        counter.subtract(used)
        answer += 1


def main():
    t = int(input())
    for _ in range(t):
        _ = int(input())
        bamboos = array.array("L", map(int, input().split()))
        print(compute_maximum(bamboos))


if __name__ == '__main__':
    main()