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Feb 21st, 2019
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  1. legal(f0(null)).
  2. legal(f1(X)) :- X = null; %true if f1(null)
  3. legal(X), %if f1.....f1(null)
  4. X \= f0(null).
  5. legal(f0(X)) :- legal(X). %if f0.....f1(null)
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