new_contents: # Define a procedure, abbaize, that takes
  # two strings as its inputs, and returns
  # a string that is the first input,
  # followed by two repetitions of the second input,
  # followed by the first input.
  
  def abbaize(aa, bb):
      return aa + bb + bb + aa
  
  #print abbaize('a','b')
  #>>> 'abba'
  
  #print abbaize('dog','cat')
  #>>> 'dogcatcatdog'
  
subject: Create 03.py