Add my practice on Chapter 9.

Included is the following file:

	Practice/Chapter_9.scm

Thank you!
							Lawrence R. Amlord
							   Sept 5th, 2013
							   Xi'an, China
Add my practice on Chapter 10.

Included is the following file:

	Practice/Chapter_10.scm

Thank you!
							Lawrence R. Amlord
							   Sept 9th, 2013
							   Xi'an, China