#include <iostream>
#include <algorithm>
#include <vector>
#include <map>

using lint = long long;

void solve() {
    std::map<int, int> cnt;

    int n;
    std::cin >> n;

    for (int i = 0; i < n; ++i) {
        int x;
        std::cin >> x;

        if (!cnt.count(x)) cnt[x] = 0;
        ++cnt[x];
    }

    int max = 0;
    for (auto p : cnt) {
        max = std::max(max, p.second);
    }

    std::cout << std::min(n / 3, (n - max) / 2) << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    int q;
    std::cin >> q;
    while (q--) solve();

    return 0;
}