Add my manuscript of answer to Exercise 3.27.

Included is the following file:

	Exercise_3.27.tm

Thank you!
							Lawrence X. Amlord
							  Oct 8th, 2013
							  Xi'an, China
Update my answer to Exercise 3.27.

Modified is the following file:

	Exercise_3.27.tm

Newly added are the following 2 files:

	Exercise_3.27.pdf
	Exercise_3.27.scm

Thank you!
							Lawrence X. Amlord
							  Oct 8th, 2013
							  Xi'an, China
Add my answer to Exercise 3.28.

Included is the following file:

	Exercise_3.28.scm

Thank you!
							Lawrence X. Amlord
							  Oct 9th, 2013
							  Xi'an, China
Add my answer to Exercise 3.29.

Included are the following 3 files:

	Exercise_3.29.pdf
	Exercise_3.29.scm
	Exercise_3.29.tm

Thank you!
							Lawrence X. Amlord
							  Oct 10th, 2013
							  Xi'an, China