How do you make Karel turn right using a custom procedure?

The correct answer makes use of Karel's ability to turn left in order to achieve a right turn. In Karel programming, when Karel turns left, it rotates 90 degrees to the left. To turn Karel right, it must effectively make three left turns because a complete rotation to the right can be achieved by turning left three times.

When Karel executes the procedure from the correct answer, it first turns left, which points Karel 90 degrees to the left of its original orientation. The second left turn reorients Karel another 90 degrees. The third left turn finally aligns Karel in the direction that would have been achieved by a single right turn. Therefore, this method accurately creates a right turn through a series of left turns, thereby successfully turning Karel right.