#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma comment(linker, "/STACK:1024000000,1024000000")
using namespace std;
int n, m, k;
vector<set<int>> adj;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
bool check(vector<int>& sub) {
  auto ord = sub;
  shuffle(ord.begin(), ord.end(), rng);
  for (int& u : ord) {
    if (adj[u].size() > 50 * k) {
      for (int& v : ord)
        if (u != v && adj[u].find(v) == adj[u].end()) return false;
    } else {
      int ptr = 0;
      for (auto& v : adj[u]) {
        while (ptr < sub.size() && (v == sub[ptr] || u == sub[ptr])) ptr++;
        if (ptr == sub.size()) break;
      }
      if (ptr != sub.size()) return false;
    }
  }
  return true;
}
int main() {
  int t;
  scanf("%d", &t);
  while (t--) {
    adj.clear();
    scanf("%d%d%d", &n, &m, &k);
    adj.resize(n + 1);
    for (int a, b, i = 0; i < m; i++) {
      scanf("%d%d", &a, &b);
      adj[a].insert(b);
      adj[b].insert(a);
    }
    if (1LL * k * (k - 1) / 2 > m) {
      printf("-1\n");
      continue;
    }
    set<pair<int, int>> ver;
    for (int i = 1; i <= n; i++) ver.insert({adj[i].size(), i});
    bool ok = false;
    while (!ver.empty() && ver.begin()->first <= k - 1) {
      int u = ver.begin()->second, sz = ver.begin()->first;
      ver.erase(ver.begin());
      if (sz == k - 1) {
        vector<int> clique{adj[u].begin(), adj[u].end()};
        clique.insert(lower_bound(clique.begin(), clique.end(), u), u);
        if (check(clique)) {
          printf("2\n");
          for (int& i : clique) printf("%d ", i);
          printf("\n");
          ok = true;
          break;
        }
      }
      for (auto& v : adj[u]) {
        ver.erase({adj[v].size(), v});
        adj[v].erase(u);
        ver.insert({adj[v].size(), v});
      }
      adj[u].clear();
    }
    if (!ok && !ver.empty()) {
      printf("1 %d\n", ver.size());
      for (auto& p : ver) printf("%d ", p.second);
      printf("\n");
    } else if (!ok)
      printf("-1\n");
  }
}
