B

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

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)
#define ff     first
#define ss     second
#define pb     push_back

int main()
{
    _test
    {
        int n;
        cin >> n;
        map <int, int> cnt;
        for(int i = 0; i < n; i++) {
          int x;
          cin >> x;
          cnt[x] += 1;
        }
        int ans = 0;
        for(auto [x, freq] : cnt) {
          if(freq > 1) {
            ++ans;
          }
        }
        cout << ans << endl;
    }
}