Update my answer to Exercise 2.42.

Included are the following 4 files:

	Exercise_2.42.pdf
	Exercise_2.42.scm
	Exercise_2.42.tm
	Test_for_Exercise_2.42.scm

Thank you!
							Lawrence X. Amlord
							  Nov 19th, 2013
							  Xi'an, China
Update my answer to Exercise 2.43.

This is a major update. The former solution has been overthrown.

Modified are the following 2 files:

	Exercise_2.43.pdf
	Exercise_2.43.tm

Thank you!
							Lawrence X. Amlord
							  Nov 19th, 2013
							  Xi'an, China