Update Exercise_1.22.scm
Update Exercise 1.22
Add my answer to Exercise 1.23.

Included are the following 4 files:

	Exercise_1.23.pdf
	Exercise_1.23.scm
	Exercise_1.23.tm
	Test_for_Exercise_1.23.scm

Thank you!
							Lawrence R. Amlord
							   May 3rd, 2013
							   Xi'an, China