HW #4 Problems from Stinson's book

4.6	(20 points)
4.19	(10 points)
5.4	(20 points)
8.3	(10 points)
8.5	(20 points)
12.6	(20 points)

Homework #4 due Tuesday November 9 1999 at 14:30 SHARP.

You are encouraged to turn in one written set of
solutions per pair of students. Please clearly identify
both authors on the first page of your work...

NOTE: problem 5.9 replaced by 12.6 on October 26, 1999.
NOTE: problem 8.4 replaced by 8.3 on November 4, 1999.