anchor.diff:    authenticate();
     writeln('JOIN ##dart-irc-codelab');
     say('Szia világ! ∀ ε ∃ δ');
  -  // writeln('QUIT');
  -  // no destroy?
   }
   
   void runIrcBot(SentenceGenerator generator) {
  
positive.code:     return possibleSequences.elementAt(rng.nextInt(possibleSequences.length));
    }
  
    String generateRandomSentence() {
      var start = pickRandomPair();
      var startingWords = start.split(" ");
      var preprevious = startingWords[0];
      var previous = startingWords[1];
      var sentence = [preprevious, previous];
      var current;
      do {
  
negative.code:         case "talk to me":
            say(sentenceGenerator.generateRandomSentence());
            return;
          default:
            if (text.startsWith("finish: ")) {
              var start = text.substring("finish: ".length);
              var sentence = sentenceGenerator.finishSentence(start);
              say(sentence == null ? "Unable to comply." : sentence);
              return;
            }
        }
      }
      print("$msgNick: $msg");
  