A trivial adjustment on Exercise_2.29.scm.
Add the code in section 2.2.2.

Included is the following file:

	2.2.2_Hierarchical_Structure.scm

Thank you!
							Lawrence X. Amlord
							  Nov 13th, 2013
							  Xi'an, China
Update my answer to Exercise 2.30.

Included are the following 2 files:

	Exercise_2.30.scm
	Test_for_Exercise_2.30.scm

Thank you!
							Lawrence X. Amlord
							  Nov 14th, 2013
							  Xi'an, China
Update my answer to Exercise 2.31.

Modified are the following 2 files:

	Exercise_2.31.scm
	Test_for_Exercise_2.31.scm

Thank you!
							Lawrence X. Amlord
							  Nov 14th, 2013
							  Xi'an, China
Update my answer to Exercise 2.32.

Modified are the following 4 files:

	Exercise_2.32.pdf
	Exercise_2.32.scm
	Exercise_2.32.tm
	Test_for_Exercise_2.32.scm

Thank you!
							Lawrence X. Amlord
							  Nov 14th, 2013
							  Xi'an, China