input: Write a function to combine two strings and reverse the result in Python.
  
  def combine_and_reverse(words, words2):
      combined = words + words2
      result = combined[::-1]
      return result
  
  assert combine_and_reverse("Hello ", "world!") == "!dlrow olleH"
  assert combine_and_reverse("Python ", "Program") == "margorP nohtyP"
  assert combine_and_reverse("OpenAI ", "GPT-3") == "3-TPG IAnepO"
  assert combine_and_reverse("Test ", "Case") == "esaC tseT"
  assert combine_and_reverse("", "") == ""
output: def combine_and_reverse(words, words2):
      combined = words + words2
      result = combined[::-1]
      return result