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abstract sclass AbstractSayAndInputBot2 extends AbstractSayAndInputBot implements Runnable {
  LS inputQueue = synchroLinkedList();
  Set<Thread> activeThreads = synchroSet();
  
  F1<S, Bool> isYes = f<S, Bool> isYes_1;
  new LinkedHashSet<S> facts;
  new LinkedHashSet<S> assumptions;
  
  L<Attractor> activeAttractors = synchroList();
    
  abstract class Attractor implements Runnable {
    abstract bool matches(S s);
  }

  *() {
    input = f<S> getInput;
  }
    
  void remember(S fact) {
    if (facts.add(fact))
      print("[Bot learned:] " + fact);
  }
  
  void assume(S fact) {
    if (assumptions.add(fact))
      print("[Bot assumes:] " + fact);
  }
  
  S getInput() {
    while (empty(inputQueue))
      sleep(10);
    ret trim(popFirst(inputQueue));
  }
  
  bool yes() {
    ret callF(isYes, input());
  }
  
  // call this instead of run() so thread is marked
  void run_public() {
    temp tempAddToCollection(activeThreads, currentThread());
    run();
  }
  
  void addInput(S s) {
    inputQueue.add(s);
    if (empty(activeThreads))
      attractorBattle();
  }
  
  void attractorBattle {
    if (empty(inputQueue)) ret;
    S input = getInput();
    print("Input: " + input);
    L<Attractor> attractors = getAndClearList(activeAttractors);
    if (empty(attractors)) ret with print("No attractors, ignoring input");
    new L<Attractor> matchingAttractors;
    for (Attractor a : attractors) pcall {
      if (a.matches(input))
        matchingAttractors.add(a);
    }
    if (empty(matchingAttractors))
      ret with print("No matching attractors, ignoring input");
    print("Got " + n2(matchingAttractors, "matching attractor") + ": " + matchingAttractors);
    Attractor winner = first(matchingAttractors);
    if (l(matchingAttractors) > 1) print("Choosing first attractor");
    winner.run();
  }
}