Add my answer to Exercise 4.47.

Included are the following 5 files:

	Exercise_4.47.pdf
	Exercise_4.47.scm
	Exercise_4.47.tm
	ch4-ambeval.scm
	ch4-mceval.scm

Thank you!
							Lawrence X. Amlord
							  Mar 11th, 2014
							  Xi'an, China
Add my answer to Exercise 4.48.

Included are the following 5 files:

	Exercise_4.48.pdf
	Exercise_4.48.scm
	Exercise_4.48.tm
	ch4-ambeval.scm
	ch4-mceval.scm

Thank you!
							Lawrence X. Amlord
							  Mar 11th, 2014
							  Xi'an, China
Add my answer to Exercise 4.49.

Included are the following 3 files:

	Exercise_4.49.scm
	ch4-ambeval.scm
	ch4-mceval.scm

Thank you!
							Lawrence X. Amlord
							  Mar 11th, 2014
							  Xi'an, China
Attach CC License to Exercise 4.47.tm (and .pdf).