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Letter to the editor by Tom Ruby in which he discusses John Swartz's article "Constructing Combinations Using LISP" (DDJ, November 1996).

					_Letters to the Editor_
by Tom Ruby

MODULE Lisp2 ;
(* Constructing combinations without LISP, or
   a makelist operation which checks for duplicate combinations *)

IMPORT FIO ;  (* For getting the output out *)
TYPE
   Ball = (Blue, Red, White, Green, Overflow ) ;
   Counter = ARRAY[ 0 .. 8 ] OF Ball ;

...
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