#include <iostream>
#include <map>

#define FORR(i,b,e) for(int i=(b);i<(int)(e);++i)
#define FOR(i,e) FORR(i,0,e)
#define dump(var) cerr << #var ": " << var << "\n"
#define dumpc(con) for(auto& e: con) cerr << e << " "; cerr<<"\n"

typedef long long ll;
typedef unsigned long long ull;

const double EPS = 1e-6;
const int d4[] = {0, -1, 0, 1, 0};

using namespace std;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int T, N, L;
    cin >> T;
    while (T--) {
        map<int,int> cnt;
        cin >> N;
        FOR(i, N) {
            cin >> L;
            cnt[L]++;
        }
        int mx = N/3, elms = N;
        for (auto& p: cnt) {
            if (p.second > mx) elms -= p.second-mx;
        }
        cout << elms/3 << "\n";
    }
    return 0;
}