Read the Case throughly, and following the requirement
http://www.docin.com/p-528088982.html Go to this website, and then go to the page 166, you can see the Case 4-2. Like these two pictures.
http://www.docin.com/p-528088982.html Go to this website, and then go to the page 166, you can see the Case 4-2. Like these two pictures.