public class BagelWorld extends BuggleWorld 
{
     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 ³subrect²

               left();               // undoes state change
               backward();           // undoes state change
               right();
          }
     }
     public void bagelLine(int n) 
     {
          if (n == 0) {        // base case
               // do nothing
          } else {             // recursive case
               dropBagel();
               forward();
               bagelLine(n-1);   // drop n-1 bagels
               backward();   // and backup
          }
     }
}