How does Karel turn right according to the provided command?

Karel turns right by executing three left turns because each left turn effectively rotates Karel 90 degrees counterclockwise. When Karel executes one left turn, it faces in a direction that is 90 degrees to the left of its original position. By performing a second left turn, Karel will be facing 180 degrees from its starting direction, and a third left turn will result in Karel facing 270 degrees from the original position, which is equivalent to a right turn. Therefore, executing three left turns results in Karel facing the same direction as a right turn would, demonstrating how Karel navigates its environment using the left turns to achieve the desired orientation.