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public class MidpointKarel extends SuperKarel
{
    public void run()
    {
        // count how many columns there are
        if(frontIsClear())
        {
            placeBalls();
            goHome();
            while(frontIsClear())
            {
                goToStack();
            }
            goToStack();
            
            // cut stack in half
            divideStack();
            
            // grab one
            // move one
            // put one down
            // go home
            
            // grab one
            // move until empty
            // put one down
            takeBall();
            while(ballsPresent())
            {
                takeBall();
                move();
                while(ballsPresent())
                {
                    move();
                }
                putBall();
                goHome();
            }
            move();
            while(ballsPresent())
            {
                takeBall();
                move();
            }
            turnAround();
            move();
            turnAround();
            putBall();
        }
        else
        {
            putBall();
        }
        
      
       
    }
        
        
    private void divideStack()
    {
         turnLeft();
        move();
        turnRight();
        while(ballsPresent())
        {
          takeBall();
          if(ballsPresent())
          {
            takeBall();
          }
          turnRight();
          move();
          putBall();
          turnAround();
          move();
          turnRight();
        }
        turnRight();
        move();
        turnLeft();
    }
   
    private void placeBalls()
    {
        while(frontIsClear())
        {
            putBall();
            move();
        }
        putBall();
    }
    
    private void goHome()
    {
        turnAround();
        while(frontIsClear())
        {
            move();
        }
        turnAround();
    }
    
    private void goToStack()
    {
        if(ballsPresent())
        {
            takeBall();
            turnAround();
            while(frontIsClear())
            {
                move();
            }
            turnRight();
            move();
            putBall();
            turnAround();
            move();
            turnLeft();
        }
        else if(frontIsClear())
        {
            move();
        }
        else if(frontIsBlocked())
        {
            if(ballsPresent())
            {
                takeBall();
                goToStack();
            }
        }
        
    }
}