B

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)

int main()
{
    _test
    {
        int n;
        cin>>n;

        vector<vector<int>> v(n);

        vector<int> cnt(100);

        for(int i=0; i<n; i++)
        {
            int k;
            cin>>k;

            v[i].resize(k);
            for(auto &e: v[i])      cin>>e;

            for(auto e: v[i])      cnt[e]++;
        }

        int ans = 0;
        vector<int> cnt2(100);

        for(int i=0; i<100; i++)
        {
            if(!cnt[i])     continue;

            fill(cnt2.begin(), cnt2.end(), 0);

            for(int j=0; j<n; j++)
            {
                if(binary_search(v[j].begin(), v[j].end(), i))       continue;

                for(auto e: v[j])       cnt2[e] = 1;
            }

            ans = max(ans, accumulate(cnt2.begin(), cnt2.end(), 0));
        }

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