#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  scanf("%d%d", &n, &m);
  if (m == 3 && (n == 5 || n == 6)) {
    printf("-1\n");
    return 0;
  }
  for (int i = 0; i < m; ++i) printf("%d %d\n", i, i * i + 10000000);
  for (int i = 0; i < n - m; ++i) printf("%d %d\n", i, -i * i - 10000000);
  return 0;
}
