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abstract sclass AbstractSayAndInputBot2 extends AbstractSayAndInputBot implements Runnable {
  LS inputQueue = synchroLinkedList();
  
  F1<S, Bool> isYes = f<S, Bool> isYes_1;
  new LinkedHashSet<S> facts;
  new LinkedHashSet<S> assumptions;
    
  *() {
    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());
  }
}