public class BagelWorld extends BuggleWorld {

  public static void main (String[] args) {
    runAsApplication(new BagelWorld(), "BagelWorld"); 
  }
  
  public void run() {
    BagelBuggle betty = new BagelBuggle();
    betty.brushUp();
    betty.bagelRect(4,5);
  }
}

class BagelBuggle extends Buggle {

  public void bagelRect(int w, int h) {
    if (h == 0) {             // base case
      // nothing to do
    } else {                  // recursive case
      bagelLine(w);         // draw bottom line
      
      left();               // move to the
      forward();            // next row
      right();
      
      bagelRect(w, h - 1);  // draw subrectangle
      
      left();               // undo state changes
      backward();
      right();
    }
  }
  
  public void bagelLine(int n) {
    if (n == 0) return;
    dropBagel();
    forward();
    bagelLine(n - 1);
    backward();
  }
}