Update Exercise 1.45.
Add my answer to Exercise 1.46.

Included are the following 4 files:

	Exercise_1.46.pdf
	Exercise_1.46.scm
	Exercise_1.46.tm
	Test_for_Exercise_1.46.scm

Thank you!
							Lawrence R. Amlord
							   May 17th, 2013
							   Xi'an, China