input: 
  def auto_complete(dictionary, prefix):
      """Generate a list of words from a given dictionary that start with a specified prefix.
      >>> auto_complete(["dog", "deer", "deal", "dungeon", "dark", "dusk"], "d")
      ['dog', 'deer', 'deal', 'dungeon', 'dark', 'dusk']
      >>> auto_complete(["dog", "deer", "deal", "dungeon", "dark", "dusk"], "de")
      ['deer', 'deal']
      >>> auto_complete(["dog", "deer", "deal", "dungeon", "dark", "dusk"], "dun")
      ['dungeon']
      """
      prefix_words = []
      for word in dictionary:
          if word.startswith(prefix):
              prefix_words.append(word)
      return prefix_words
  
output:     prefix_words = []
      for word in dictionary:
          if word.startswith(prefix):
              prefix_words.append(word)
      return prefix_words