(* DiscreteMath`CombinatoricaV0.9 goes with:

 	Implementing Discrete Mathematics: Combinatorics and Graph Theory
				with Mathematica

It contains all the programs from the book, "Implementing
Discrete Mathematics: Combinatorics and Graph Theory with Mathematica"
by Steven S. Skiena, Addison-Wesley Publishing Co., Advanced Book Program,
350 Bridge Parkway, Redwood City CA 94065.  ISBN 0-201-50943-1.
For ordering information, call 1-800-447-2226.
 *)
Get[ "DiscreteMath`CombinatoricaV0.6" ]
Get[ "DiscreteMath`CombinatoricaV0.9" ]

(* The below is from https://library.wolfram.com/infocenter/MathSource/6825/
 An alpha test version is at:
 http://www.nic.funet.fi/index/Science/math/mathematica/Logic/RSolve.m
 *)
Get[ "DiscreteMath`RSolve`" ]
