input: 
  from typing import List
  
  def reverse_and_concatenate(words: List[str]) -> str:
      """ Combines 2 strings and reverses the result.
      >>> reverse_and_concatenate(["Hello ", "world!"])
      '!dlrow olleH'
      >>> reverse_and_concatenate(["Python", " is fun!"])
      '!nuf si nohtyP'
      """
  
output:     combined = ''.join(words)
      return combined[::-1]