Add my answer to Exercise 2.30.

Included are the following 2 files:

	Exercise_2.30.scm
	Test_for_Exercise_2.30.scm

Thank you!
							Lawrence R. Amlord
							   May 31st, 2013
							   Xi'an, China
Add my answer to Exercise 2.31.

Included are the following 2 files:

	Exercise_2.31.scm
	Test_for_Exercise_2.31.scm

Thank you!
							Lawrence R. Amlord
							   May 31st, 2013
							   Xi'an, China
Add my answer to Exercise 2.32.

Included are the following 4 files:

	Exercise_2.32.pdf
	Exercise_2.32.scm
	Exercise_2.32.tm
	Test_for_Exercise_2.32.scm

Thank you! Happy Children's Day!
							Lawrence R. Amlord
							   Jun 1st, 2013
							   Xi'an, China