rem: print_kth (unsigned int k, int *range_start)
add: print_kth (size_t k, bool *range_start)
context: print_kth (unsigned int k, int *range_start){  if (0 < eol_range_start && eol_range_start <= k)    {      if (range_start)	*range_start = (k == eol_range_start);      return 1;    }  if (k <= max_range_endpoint && printable_field[k])    {      if (range_start)	*range_start = (printable_field[k] == RANGE_START_SENTINEL);      return 1;    }  return 0;}