Update my answer to Exercise 1.11.

I've Modified the following 2 files:

	Exercise_1.11.pdf
	Exercise_1.11.tm

Additionally, I've reorganized the Scheme source files:

	deleted:    Exercise_1.11-Iterative.scm
	deleted:    Exercise_1.11-Recursive.scm

	new file:   Exercise_1.11.scm
	new file:   Test_of_Exercise_1.11.scm

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