Add my answer to Exercise 4.55.

Included are the following 3 files:

	Exercise_4.55.pdf
	Exercise_4.55.scm
	Exercise_4.55.tm

Thank you!
							Lawrence X. Amlord
							  Mar 21st, 2014
							  Xi'an, China
Add my answer to Exercise 4.56.

Included are the following 2 files:

	Exercise_4.56.pdf
	Exercise_4.56.tm

Thank you!
							Lawrence X. Amlord
							  Mar 21st, 2014
							  Xi'an, China