def print_combinations(pattern: str):
  """
  Recursively is called to replace the '?' with '0' and '1' and print combinations
  """
  question_pos = pattern.find("?")
  if question_pos == -1:
    print(pattern)
  else:
    for i in ["0", "1"]:
      print_combinations(pattern[0:question_pos] + i + pattern[question_pos+1:])

print_combinations("0???1")