code: func RespondWithNicety(in *dt.Msg) string {
  	for _, w := range in.Stems {
  		// Since these are stems, some of them look incorrectly spelled.
  		// Needless to say, these are the correct Porter2 Snowball stems
  		switch w {
  		case "thank":
  			return "You're welcome!"
  		case "cool", "sweet", "awesom", "neat", "perfect":
  			return "I know!"
  		case "sorri":
  			return "That's OK. I forgive you."
  		case "hi", "hello":
  			return "Hi there. :)"
  		}
  	}
  	return ""
  }
docs: // RespondWithNicety replies to niceties that humans use, but Abot can ignore.
  // Words like "Thank you" are not necessary for a robot, but it's important Abot
  // respond correctly nonetheless.