code: def known_nicknames():
      """
      Return a list of all the transformer nicknames
  
      We return a list so that we can sort them in decreasing key length
      """
      nicknames = list(
          value for key, value in TRANSFORMER_NICKNAMES.items()
      )
  
      # previously unspecific transformers get "transformer" as the nickname
      nicknames.append("transformer")
  
      nicknames = sorted(nicknames, key=lambda x: -len(x))
  
      return nicknames
  
label_desc: Use image node_id 2 for calling a global function with example usage: known_nicknames() and returns: nicknames