#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int T,N;
    cin >> T;
    rep(i,0,T){
        cin >> N;
        map<int,int> mp;
        rep(j,0,N){
            int a;
            cin >> a;
            mp[a]++;
        }
        vector<int> V;
        for(auto p:mp)V.push_back(p.second);
        sort(V.rbegin(), V.rend());
        int ans = N/3;
        if(V.size() >= 1)ans = min(ans, (N - V[0]) / 2);
        if(V.size() >= 2)ans = min(ans, N - V[0] - V[1]);

        cout << ans << endl;
    }
}