#include <bits/stdc++.h>
using namespace std;
int n, k, x, dy, y;
void p(int x, int y) { printf("%d %d\n", x, y); }
int main() {
  scanf("%d%d", &n, &k);
  if (k == 3) {
    if (n == 3) {
      printf("0 0\n0 1\n1 0\n");
      return 0;
    }
    if (n == 4) {
      printf("0 0\n0 100\n100 0\n1 1\n");
      return 0;
    }
    printf("-1");
    return 0;
  }
  p(0, 0);
  n--;
  k--;
  dy = 300;
  x = 0;
  y = 0;
  while (k > 0) {
    x--;
    dy--;
    p(x, y + dy);
    k--;
    n--;
    if (k == 0) break;
    p(x, -y - dy);
    k--;
    n--;
    y += dy;
  }
  dy = 300;
  x = 100;
  y = 0;
  while (n > 0) {
    x++;
    dy--;
    p(x, y + dy);
    n--;
    if (n == 0) break;
    p(x, -y - dy);
    n--;
    y += dy;
  }
  return 0;
}
