Add the code in section 2.2.3.

Included is the following file:

	2.2.3_Sequences_as_Conventional_Interfaces.scm

Thank you!
							Lawrence X. Amlord
							  Nov 18th, 2013
							  Xi'an, China
Update my answer to Exercise 2.39.

Modified are the following 2 files:

	Exercise_2.39.pdf
	Exercise_2.39.tm

Thank you!
							Lawrence X. Amlord
							  Nov 18th, 2013
							  Xi'an, China