#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cmath>
#include<cctype>
#include<math.h>
#include<string>
#include<string.h>
#include<stack>
#include<queue>
#include<vector>
#include<utility>
#include<set>
#include<map>
#include<stdlib.h>
#include<iomanip>

using namespace std;

#define ll long long
#define ld long double
#define EPS 0.0000000001
#define INF 1e9
#define MOD 1000000007
#define rep(i,n) for(int i=0;i<(n);i++)
#define loop(i,a,n) for(int i=a;i<(n);i++)
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)

#define int ll //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

typedef vector<int> vi;
typedef vector<string> vs;
typedef pair<int,int> pii;

int gcd(int a, int b){
    if(b==0) return a;
    return gcd(b,a%b);
}
int lcm(int a, int b){
    return a*b/gcd(a,b);
}


signed main(void) {
    int i,j;
    int t;
    cin >> t;
    while(t--){
        int n;
        cin >> n;
        vi a(n);
        rep(i,n) cin >> a[i];
        sort(all(a));
        vi used(n,0);
        int ans = 0;
        rep(i,n)if(used[i] == 0){
            used[i] = 1;
            loop(j,i+1,n)if(used[j] == 0 && a[i] != a[j]){
                loop(k,j+1,n)if(used[k] == 0 && a[j] != a[k]){
                    ans++;
                    used[j] = used[k] = 1;
                    break;
                }
                if(used[j])break;
            }

        }
        cout << ans << endl;
    }
}