#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000



int main(){
	
	int _t;
	cin>>_t;
	
	rep(_,_t){
		int n;
		cin>>n;
		map<int,int> mp;
		rep(i,n){
			int a;
			cin>>a;
			mp[a]++;
		}
		priority_queue<int> Q;
		for(auto a:mp){
			Q.push(a.second);
		}
		int ans = 0;
		while(Q.size()>=3){
			vector<int> t(3);
			rep(i,3){
				t[i] = Q.top();
				Q.pop();
			}
			ans++;
			rep(i,3){
				//cout<<t[i]<<endl;
				if(t[i]>=2){
					Q.push(t[i]-1);
				}
			}
			
		}
		cout<<ans<<endl;
	}
	
	return 0;
}