old_contents: # Create queue using a list
  
  class Queue:
  	def __init__(self, head=None):
  		self.storage = [head]
  
new_contents: # Create queue using a list
  
  class Queue:
  	def __init__(self, head=None):
  		self.storage = [head]
  
  	def enqueue(self, new_element):
  		self.storage.append(new_element)
  
subject: Add enqueue method