// These end up inside the main class

static class LBox extends LearnerImpl {
  static boolean debug;
  Learner middleLearner;
  char topChar, bottomChar;
  
  *(Learner middleLearner) {
    this.middleLearner = middleLearner;
  }
  
  // An optimization, but a bit of a dangerous one:
  /*public void forwardSecretExample(Object _in, Object _out) {
    String in = (String) _in, out = (String) _out;
    L<S> l = toLines(out);
    String middle = l.get(2);
    middleLearner.processInOut(in, middle);
  }*/
  
  public void tryAgain() {
    middleLearner.tryAgain();
  }
  
  public void processInOut(Object _in, Object _out) {
    String in = (String) _in, out = (String) _out;
    L<S> l = toLines(out);
    String middle = l.get(2);
    middleLearner.processInOut(in, middle);
    topChar = l.get(1).charAt(0);
    bottomChar = l.get(3).charAt(0);
  }
  
  public Object processIn(Object in) {
    String middle = (String) middleLearner.processIn(in);
    return "\n" +
      main.repeat(topChar, middle.length()) + "\n" +
      middle + "\n" +
      main.repeat(bottomChar, middle.length()) + "\n";
  }
  
  public void toJava(Code code) {
    todo();
  }
}

static class LBox2 extends LearnerImpl {
  static boolean debug;
  Learner middleLearner;
  char topChar, bottomChar, tlChar, trChar, blChar, brChar;
  
  *(Learner middleLearner) {
    this.middleLearner = middleLearner;
  }
  
  public void tryAgain() {
    middleLearner.tryAgain();
  }
  
  public void processInOut(Object _in, Object _out) {
    String in = (String) _in, out = (String) _out;
    L<S> l = toLines(out);
    String middle = l.get(2);
    if (debug)
      System.out.println("Forwarding to middle learner: " + quote(in) + " => " + quote(middle));
    middleLearner.processInOut(in, middle);
    String top = l.get(1), bottom = l.get(3);
    tlChar = top.charAt(0);
    topChar = top.charAt(1);
    trChar = top.charAt(top.length()-1);
    blChar = bottom.charAt(0);
    bottomChar = bottom.charAt(1);
    brChar = bottom.charAt(bottom.length()-1);
  }
  
  public Object processIn(Object in) {
    String middle = (String) middleLearner.processIn(in);
    return "\n" +
      tlChar + main.repeat(topChar, middle.length()-2) + trChar + "\n" +
      middle + "\n" +
      blChar + main.repeat(bottomChar, middle.length()-2) + brChar + "\n";
  }
  
  public void toJava(Code code) {
    todo();
  }
}