#include <bits/stdc++.h>
using namespace std;
const long double epsilon = 1e-9;
int main() {
  long long n, m, v;
  cin >> n >> m >> v;
  long long p = ((n - 1) * (n - 2)) / 2LL + 1;
  if (m > p || m < n - 1) {
    cout << -1 << endl;
    return 0;
  }
  int other = 1;
  if (v == 1) other = 2;
  for (int i = 1; i <= n; i++) {
    if (i == v)
      continue;
    else
      cout << v << " " << i << endl;
  }
  m -= n - 1;
  for (int i = 1; i <= n && m > 0; i++) {
    if (i == v || i == other) continue;
    for (int j = i + 1; j <= n && m > 0; j++) {
      if (j == v || j == other || j == i) continue;
      printf("%d %d\n", i, j);
      m--;
    }
  }
  return 0;
}
