A

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

int main(){
    int t;
    cin>>t;

    while(t--){
        int n;
        cin>>n;

        vector<int> a(n);
        for(auto &e: a)
            cin>>e;

        map<int, int> cnt;
        for(auto e: a)      cnt[e]++;

        int ans = 0;

        for(auto [x, y]: cnt)     ans += y/3;

        cout<<ans<<"\n";
    }
}