#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 7;
const int MOD = 1e9 + 7;
const int MAXN = 1e6 + 3;
const double EPS = (1e-7);
int dcmp(double x, double y) { return fabs(x - y) <= EPS ? 0 : x < y ? -1 : 1; }
long long gcd(long long a, long long b) {
  if (b == 0)
    return a;
  else
    return gcd(b, a % b);
}
long long power(long long x, long long y) {
  long long res = 1;
  while (y > 0) {
    if (y & 1) res = res * x;
    y = y >> 1;
    x = x * x;
  }
  return res;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n, m, v;
  cin >> n >> m >> v;
  int maxcon = ((n - 1) * (n - 2)) / 2 + 1;
  if (m > maxcon or m < n - 1) {
    cout << -1 << endl;
  } else {
    for (int i = 1; i <= n; i++) {
      if (i != v) {
        cout << i << " " << v << " \n";
        m--;
      }
    }
    int pr = 1;
    if (pr == v) {
      pr++;
    }
    for (int i = 1; i <= n and m; i++) {
      if (i != v and i != pr) {
        for (int j = i + 1; j <= n and m; j++) {
          if (j != v and j != pr) {
            cout << i << " " << j << endl;
            m--;
          }
        }
      }
    }
  }
}
