code: def split(sentence):
      """Splits a sentence into words.
  
      Args:
          sentence (str): A sentence to split.
  
      Returns:
          list of str: A list of words. Punctuations are removed.
  
      """
      return sentence.lower().replace(".", "").replace("?", "").split()
  
imports: import collections
label_desc: Use image node_id 1 for calling a global function with example usage: split(sentence) and returns: sentence