#include "library.h"

void count_down_from(int N)
{ if (N != 0)
  { print(N);
    new_line();
    count_down_from(N - 1); } }

void count_up(int from, int to)
{ if (from <= to)
  { print(from);
    print(", ");
    count_up(from + 1, to); } }

void alternative_count_up(int from, int to)
{ print(from);
  if (from <= to)
  { print(", ");
    alternative_count_up(from + 1, to); } }

void main()
{ count_down_from(20);
  new_line();
  count_up(1, 15);
  new_line();
  alternative_count_up(0, 10);
  new_line(); }