#include <cstdio>

int main() {
  for (int x=0,y=0; y<10; y=++x) {
    printf("%d %d\n",x,y);
  }
  printf("***\n");

  for (int x=0,y=0; y<10; y=x++) {
    printf("%d %d\n",x,y);
  }

  return 0;
}