Add my answer to Exercise 3.47.

Included is the following file:

	Exercise_3.47.scm

Thank you!
							Lawrence X. Amlord
							  Nov 7th, 2013
							  Xi'an, China
Add my answer to Exercise 3.48.

Included are the following 3 files:

	Exercise_3.48.pdf
	Exercise_3.48.scm
	Exercise_3.48.tm

Thank you!
							Lawrence X. Amlord
							  Nov 8th, 2013
							  Xi'an, China