Add my answer to Exercise 4.11.

Included is the following file:

	Exercise_4.11.scm

Thank you!
							Lawrence X. Amlord
							  Jan 25th, 2014
							  Fuzhou, China
Add my answer to Exercise 4.12.

Included is the following file:

	Exercise_4.12.scm

Thank you!
							Lawrence X. Amlord
							  Jan 25th, 2014
							  Fuzhou, China
Update my answer to Exercise 4.12.

This is a major revision, I've modified the answer thoroughly.

Included is the following file:

	Exercise_4.12.scm

Thank you!
							Lawrence X. Amlord
							  Jan 25th, 2014
							  Fuzhou, China
Fix the typo of date in Exercise_4.12.scm.
Fix the typo on date in Exercise_4.11.scm.
Add my answer to Exercise 4.13.

Included is the following 3 files:

	Exercise_4.13.pdf
	Exercise_4.13.scm
	Exercise_4.13.tm

Thank you!
							Lawrence X. Amlord
							  Jan 26th, 2013
							  Fuzhou, China
Add the code in section 4.1.4.

Included is the following file:

	4.1.4_Running_the_Evaluator_as_a_Program.scm

Thank you!
							Lawrence X. Amlord
							  Jan 27th, 2014
							  Fuzhou, China
Implement the Metacircular Evaluator.

Included are the following 2 files:

	Metacircular_Evaluator.scm
	Test_for_Metacircular_Evaluator.scm

Thank you!
							Lawrence X. Amlord
							  Jan 30th, 2014
							  Fuzhou, China
Add my answer to Exercise 4.14.

Included is the following file:

	Exercise_4.14.pdf
	Exercise_4.14.tm
	Metacircular_Evaluator.scm
	Test_for_Exercise_4.14.scm

Thank you!
							Lawrence X. Amlord
							  Feb 1st, 2014
							  Fuzhou, China