Update file:"Test_of_Code_in_2.4.3.scm".
Update my answer to Exercise 2.78.

I've modified the following 3 files:

	Exercise_2.78.pdf
	Exercise_2.78.scm
	Exercise_2.78.tm

as well as added a new file in:

	Test_of_Exercise_2.78.scm

Thank you!
							Lawrence R. Amlord
							   Aug 6th, 2013
							   Xi'an, China