#include <bits/stdc++.h>
using namespace std;

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

    int T; cin >> T;
    while(T--){
        int N; cin >> N;
        map<int,int> C;
        for(int i=0; i<N; i++){
            int l; cin >> l;
            C[l]++;
        }
        int low = 0,high = N/3+1;
        while(high-low > 1){
            int sum = 0,mid = (high+low)>>1;
            for(auto [k,v] : C) sum += min(mid,v);
            if(sum >= mid*3) low = mid;
            else high = mid;
        }
        cout << low << "\n";
    }
}