code: def make_key(*args):
      """Handy for short truth table keys"""
      key = ""
      for a in args:
          if hasattr(a, "value"):
              raise ValueError("Unexpected type")
          else:
              key += str(a).lower()[0]
      return key
  
label_desc: Use image node_id 2 for calling a global function with example usage: make_key() and returns: key