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Apr 20th, 2018
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  1. lenk(X,Y):-
  2.     X = 0,
  3.     Y is 1.
  4.  
  5. lenk(X,Y):-
  6.     X > 0,
  7.     0 is X mod 2,
  8.     Z is X - 2,
  9.     lenk(Z,N),
  10.     Y is X*N.
  11.  
  12. lenk(X,Y):-
  13.     X > 0,
  14.     1 is X mod 2,
  15.     Z is X - 1,
  16.     lenk(Z,N),
  17.     Y is X*N.
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