Copyright (c) 1989-1996 by Gary T. Leavens.
Permission is granted for you to make copies for educational and scholarly
purposes, but not for direct commercial advantage, provided this notice
appears on all copies.  All other rights reserved.

Warning: mistakes, difficulties, etc. in homeworks from previous semesters
are often solved in subsequent semesters.  If you are an academic and
use anything from a semester other than the latest one, you may be in for
trouble.  So treat all such homeworks carefully.

No guarantees or warranty for anything here.