hw6.tex includes a diagram produced using Diagram!.  The file
sample-list.diagram is the source form of this diagrams, but it won't
be useful to others without this software.  The corresponding
sample-list.eps file is what is actually included in the hw6.tex
document.  Even to TeX and print that you will need dvips and the
epsf.sty document style option that comes with it.  For those with
none of the above, the hw6.ps is a pre dvips'ed version, ready to
print on any 300dpi postscript printer.
