Add my answer to Exercise 2.69.

Included are the following 4 files:

	Exercise_2.69.pdf
	Exercise_2.69.scm
	Exercise_2.69.tm
	Test_of_Exercise_2.69.scm

Thank you!
							Lawrence R. Amlord
							   Jul 24th, 2013
							   Xi'an, China
Add my answer to Exercise 2.70.

Included are the following 4 files:

	Exercise_2.70.pdf
	Exercise_2.70.scm
	Exercise_2.70.tm
	Test_of_Exercise_2.70.scm

Thank you!
							Lawrence R. Amlord
							   Jul 24th, 2013
							   Xi'an, China
Add my answer to Exercise 2.71.

Included are the following 2 files:

	Exercise_2.71.pdf
	Exercise_2.71.tm

Thank you!
							Lawrence R. Amlord
							   Jul 25th, 2013
							   Xi'an, China