Update my answer to Exercise 1.22.
Update my answer to Exercise 1.23.
Add my answer to Exercise 1.24.

Included are the following 4 files:

	Exercise_1.24.pdf
	Exercise_1.24.scm
	Exercise_1.24.tm
	Test_for_Exercise_1.24.scm

Thank you!
							Lawrence R. Amlord
							   May 5th, 2013
							   Xi'an, China
Add my answer to Exercise 1.25.

Included are the following 4 files:

	Exercise_1.25.pdf
	Exercise_1.25.scm
	Exercise_1.25.tm
	Test_for_Exercise_1.25.scm

Thank you!
							Lawrence R. Amlord
							   May 5th, 2013
							   Xi'an, China