Purpose: Find out a basis of all possible brackets consisting of
=======  a fixed number of X's and a fixed number of Y's with
         [X,[X,[X,Y]]]=0.

                                        Ren-Cang Li, June 1, 1996
                                        na.rcli@na-net.ornl.gov

Files in this directory:
===== == ==== =========

  Driver Routines: 
  ------ -------- 

     X2Y2  ---  two   X's, two   Y's

     X2Y3  ---  two   X's, three Y's

     X2Y4  ---  two   X's, four  Y's

     X2Y5  ---  two   X's, five  Y's

     X3Y2  ---  three X's, two   Y's

     X3Y3  ---  three X's, three Y's

     X3Y4  ---  three X's, four  Y's

     X4Y2  ---  four  X's, two   Y's

     X4Y3  ---  four  X's, three Y's

     X5Y2  ---  five  X's, two   Y's

  Auxiliary Routines:
  --------- --------

     ReduceH  --- In the heads of every driver routine for brackets
                  with X, and Y.

     ReduceT  --- In the tails of every driver routine

To Run: Take any driver routine XXXX, and type <<XXXX after Mathematica
== ===  prompt.
