Prolog "warez"

         
/**
         
 * Warranty & Liability
         
 * To the extent permitted by applicable law and unless explicitly
         
 * otherwise agreed upon, XLOG Technologies AG makes no warranties
         
 * regarding the provided information. XLOG Technologies AG assumes
         
 * no liability that any problems might be solved with the information
         
 * provided by XLOG Technologies AG.
         
 *
         
 * Rights & License
         
 * All industrial property rights regarding the information - copyright
         
 * and patent rights in particular - are the sole property of XLOG
         
 * Technologies AG. If the company was not the originator of some
         
 * excerpts, XLOG Technologies AG has at least obtained the right to
         
 * reproduce, change and translate the information.
         
 *
         
 * Reproduction is restricted to the whole unaltered document. Reproduction
         
 * of the information is only allowed for non-commercial uses. Selling,
         
 * giving away or letting of the execution of the library is prohibited.
         
 * The library can be distributed as part of your applications and libraries
         
 * for execution provided this comment remains unchanged.
         
 *
         
 * Restrictions
         
 * Only to be distributed with programs that add significant and primary
         
 * functionality to the library. Not to be distributed with additional
         
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 *
         
 * Trademarks
         
 * Jekejeke is a registered trademark of XLOG Technologies AG.
         
 */
         

         
:- dynamic(foo/2).
         

         
warehouse(0, _, _) :- !.
         
warehouse(N, X, Y) :-
         
   assertz(foo(Y, bar)),
         
   (retract(foo(X, bar)) -> true; true),
         
   zx81(X, Z), zx81(Y, T),
         
   M is N-1,
         
   warehouse(M, Z, T).
         

         
zx81(X, Y) :- Y is (X*75+74) mod 65537.
         

         
warez :-
         
   retractall(foo(_,_)),
         
   warehouse(50000, 1, 18884).