Add my answer to Exercise 1.19.

Included are the following 3 files:

	Exercise_1.19.pdf
	Exercise_1.19.scm
	Exercise_1.19.tm

By a first glance, one might superficially conclude that this exercise is
easy--with only 2 slots to fill in, however, this really isn't the case.
This exercise requires the reader a careful observation, a maturity of
mathematical deduction and the ability to deliberate it on different levels
of abstraction. But don't be intemidated by its difficulty, you ability of
abstract thinking will be improved as long as you are willing to involve in
interacting with it.

All in all, it is worthwhile devoting a great efforts to tackle this chal-
lenge.

Thank you!
							Lawrence R. Amlord
							   Apr 28, 2013
							   Xi'an, China
Add my answer to Exercsie_1.20.

Included are the following 2 files:

	Exercise_1.20.pdf
	Exercise_1.20.tm

Thank you!
							Lawrence R. Amlord
							   May 1st, 2013
							   Xi'an, China
Rename diretory 'Practice' to 'Examples_to_Practice'.
Add implementation for Example: Searching_for_Divisors.

Included are the following 2 files:

	Searching_for_Divisors.scm
	Testing_for_Searching_for_Divisors.scm

Thank you!
							Lawrence R. Amlord
							   May 1st, 2013
							   Xi'an, China
Add implementation for Example: The Fermat Test.

Included are the following 2 files:

	Testing_for_The_Fermat_Test.scm
	The_Fermat_Test.scm

Thank you!
							Lawrence R. Amlord
							  May 1st, 2013
							  Xi'an, China
Update The_Fermat_Test.scm.
Add my answer to Exercise_1.21.

Included are the following 4 files:

	Exercise_1.21.pdf
	Exercise_1.21.scm
	Exercise_1.21.tm
	Testing_for_Exercise_1.21.scm

Thank you!
							Lawrence R. Amlord
							  May 2nd, 2013
							  Xi'an, China
Add my answer to Exercise 1.22.

Included are the following 4 files:

	Exercise_1.22.pdf
	Exercise_1.22.scm
	Exercise_1.22.tm
	Test_for_Exercise_1.22.scm

Thank you!
							Lawrence R. Amlord
							   May 2nd, 2013
							   Xi'an, China