Add my answer to Exercise 3.51.

Included is the following file:

	Exercise_3.51.scm

Thank you!
							Lawrence X. Amlord
							  Nov 21st, 2013
							  Xi'an, China
Add my answer to Exercise 3.52.

Included is the following file:

	Exercise_3.52.scm

Thank you!
							Lawrence X. Amlord
							  Nov 22nd, 2013
							  Xi'an, China