Add my answer to Exercise 2.14.

Included are the following 2 files:

	Exercise_2.14.scm
	Test_for_Exercise_2.14.scm

Thank you!
							Lawrence R. Amlord
							   May 26th, 2013
							   Xi'an, China
Add my answer to Exercise 2.15.

Included are the following 2 files:

	Exercise_2.15.pdf
	Exercise_2.15.tm

Thank you!
							Lawrence R. Amlord
							   May 26th, 2013
							   Xi'an, China
Add my answer to Exercise 2.17.

Included are the following 4 files:

	Exercise_2.17.pdf
	Exercise_2.17.scm
	Exercise_2.17.tm
	Test_for_Exercise_2.17.scm

Thank you!
							Lawrence R. Amlord
							   May 27th, 2013
							   Xi'an, China