#include <bits/stdc++.h>
using namespace std;
char _buf[100000], *_p1 = _buf, *_p2 = _buf;
inline int gi() {
  int x = 0, f = 1;
  char ch = (_p1 == _p2 && (_p2 = (_p1 = _buf) + fread(_buf, 1, 100000, stdin),
                            _p1 == _p2)
                 ? EOF
                 : *_p1++);
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = (_p1 == _p2 && (_p2 = (_p1 = _buf) + fread(_buf, 1, 100000, stdin),
                         _p1 == _p2)
              ? EOF
              : *_p1++);
  }
  while (ch >= '0' && ch <= '9') {
    x = (x << 3) + (x << 1) + (ch ^ 48);
    ch = (_p1 == _p2 && (_p2 = (_p1 = _buf) + fread(_buf, 1, 100000, stdin),
                         _p1 == _p2)
              ? EOF
              : *_p1++);
  }
  return (f == 1) ? x : -x;
}
inline int max(int a, int b) { return a > b ? a : b; }
inline int min(int a, int b) { return a < b ? a : b; }
const int maxn = 2e5 + 5;
int n, m, T;
vector<int> vec[maxn];
int ind[maxn], k;
set<int> s[maxn];
bool vis[maxn], vis2[maxn];
vector<int> ans;
queue<int> q;
inline void init() {
  for (int i = 1; i <= n; ++i)
    vec[i].clear(), ind[i] = 0, s[i].clear(), vis[i] = 0, vis2[i] = 0;
  ans.clear();
  while (!q.empty()) q.pop();
}
inline void input() {
  n = gi(), m = gi(), k = gi();
  for (int i = 1; i <= m; ++i) {
    int u = gi(), v = gi();
    vec[u].push_back(v), vec[v].push_back(u);
    ind[u]++, ind[v]++;
  }
}
inline void dfs(int u) {
  vis2[u] = 1;
  ans.push_back(u);
  for (auto v : vec[u]) {
    if (!vis[v] && !vis2[v]) {
      dfs(v);
    }
  }
}
struct node {
  int u, indd;
  node(int uu = 0, int ii = 0) { u = uu, indd = ii; }
  inline bool operator<(const node &b) const { return indd < b.indd; }
};
inline bool check(int u, int xx) {
  vector<int> vec1;
  vec1.clear();
  vec1.push_back(u);
  for (auto x : s[u]) {
    if (ind[x] < k - 1) return 0;
    for (auto y : vec1) {
      if (!s[x].count(y)) {
        return 0;
      }
    }
    vec1.push_back(x);
  }
  return 1;
}
inline void solve(int xx) {
  if (k == 1) {
    printf("2\n1\n");
    return;
  }
  for (int i = 1; i <= n; ++i) {
    for (auto x : vec[i]) s[i].insert(x);
    ind[i] = s[i].size();
  }
  for (int i = 1; i <= n; ++i) {
    if (ind[i] < k) q.push(i), vis[i] = 1;
    if (ind[i] == k - 1) {
      if (1LL * k * (k - 1) <= 2 * m && check(i, xx)) {
        printf("2\n");
        for (auto x : s[i]) printf("%d ", x);
        printf("%d\n", i);
        return;
      }
    }
  }
  while (!q.empty()) {
    int u = q.front();
    q.pop();
    for (auto v : s[u]) {
      ind[v]--;
      s[v].erase(u);
      if (!vis[v] && ind[v] < k) vis[v] = 1, q.push(v);
      if (1LL * k * k <= 2 * m && ind[v] == k - 1) {
        if (check(v, xx)) {
          printf("2\n");
          for (auto x : s[v]) printf("%d ", x);
          printf("%d\n", v);
          return;
        }
      }
    }
    s[u].clear();
  }
  bool ok = 0;
  for (int i = 1; i <= n; ++i) {
    if (!vis[i]) {
      ok = 1;
      dfs(i);
      break;
    }
  }
  if (ok) {
    printf("1 %d\n", (int)(ans.size()));
    for (auto x : ans) printf("%d ", x);
    printf("\n");
    return;
  }
  printf("-1\n");
}
int main() {
  T = gi();
  for (int i = 1; i <= T; ++i) {
    init();
    input();
    solve(i);
  }
  return 0;
}
