#include <bits/stdc++.h>
using namespace std;
const int INF = int(1e9);
const double EPS = 1e-5;
const long long mod = ((long long)1e18) - 131;
int n, m, k, x = 0, y = 0, ans = 0, r = 1, e = 1, h = 0, plc;
vector<pair<int, int> > u;
vector<pair<int, int> > d;
int main() {
  srand(time(NULL));
  scanf("%d %d", &n, &m);
  if (m == 3 && n > 4) {
    cout << -1;
    return 0;
  }
  x = 0;
  y = 10000000;
  for (int i = 0; i <= 100; i++) {
    u.push_back(make_pair(x, y));
    d.push_back(make_pair(x, -y));
    if (x) {
      u.push_back(make_pair(-x, y));
      d.push_back(make_pair(-x, -y));
    }
    x++;
    y += e;
    e += rand() % 1000;
  }
  for (int i = 0; i < m; i++) {
    printf("%d %d\n", u[i].first, u[i].second);
  }
  for (int i = 0; i < n - m; i++) {
    printf("%d %d\n", d[i].first, d[i].second);
  }
  return 0;
}
