#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()

vector<vector<int>> gr;
vector<int> mpair;
constexpr int N = 151;
bitset<N> used_1, used_2, used_3;

bool try_kunh(int v) {
    if (used_1[v]) return false;
    used_1[v] = true;
    for(int &u : gr[v]) {
        if (mpair[u] < 0 || try_kunh(mpair[u])) {
            mpair[u] = v;
            return true;
        }
    }
    return false;
}

void dfs(int v, bool indef) {
    if (indef) {
        used_1[v] = 1;
        indef ^= 1;
        for(int &u : gr[v]) {
            if (!used_2[u]) {
                dfs(u, indef);
            }
        }
        return;
    }
    used_2[v] = 1;
    indef ^= 1;
    if (mpair[v] != -1 && !used_1[mpair[v]]) {
        dfs(mpair[v], indef);
    }
}
signed main() {
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int t = 1;
    cin >> t;
    while (t--) {
        gr.clear(); mpair.clear();
        used_1 = 0; used_2 = 0;
        int n, m;
        cin >> n >> m;
        gr.resize(n);
        for (int i = 0; i < n; i++) {
            bitset<N> push = 0;
            int v;
            while (cin >> v) {
                if (v == 0) break;
                else push[v - 1] = 1;
            }
            for (int j = 0; j < m; j++) if (!push[j]) gr[i].push_back(j);
        }
        mpair.resize(m, -1);
        used_1 = 0, used_2 = 0, used_3 = 0;
        for (int i = 0; i < n; i++) if (try_kunh(i)) used_1 = 0;
        for (int i = 0; i < m; i++) if (mpair[i] != -1) used_3[mpair[i]] = 1;
        used_1 = 0; used_2 = 0;
        for (int i = 0; i < n; i++) if (!used_3[i]) dfs(i, 1);
        vector<int> ans1, ans2;
        for (int i = 0; i < n; i++) if (used_1[i]) ans1.push_back(i + 1);
        for (int i = 0; i < m; i++) if (!used_2[i]) ans2.push_back(i + 1);
        cout << (int)ans1.size() + (int)ans2.size() << '\n';
        cout << (int)ans1.size() << ' ' << (int)ans2.size() << '\n';
        for (int &res : ans1) {
            cout << res << ' ';
        }
        cout << '\n';
        for (int &res : ans2) {
            cout << res << ' ';
        }
        cout << '\n';
    }
}