input: 
  def reverse_combined_strings(word1: str, word2: str) -> str:
      """ Combine two strings and reverse the result.
      >>> reverse_combined_strings("Hello ", "world!")
      "!dlrow olleH"
      """
      combined = word1 + word2
      return combined[::-1]
  
output:     combined = word1 + word2
      return combined[::-1]