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diff --git a/test/samples/uscxml/prolog/likes.pl b/test/samples/uscxml/prolog/likes.pl
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--- a/test/samples/uscxml/prolog/likes.pl
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-%% Demo coming from http://clwww.essex.ac.uk/course/LG519/2-facts/index_18.html
-%%
-%% Please load this file into SWI-Prolog
-%%
-%% Sam's likes and dislikes in food
-%%
-%% Considering the following will give some practice
-%% in thinking about backtracking.
-%% ?- likes(sam,dahl).
-%% ?- likes(sam,chop_suey).
-%% ?- likes(sam,pizza).
-%% ?- likes(sam,chips).
-%% ?- likes(sam,curry).
-
-likes(sam,Food) :-
-        indian(Food),
-        mild(Food).
-likes(sam,Food) :-
-        chinese(Food).
-likes(sam,Food) :-
-        italian(Food).
-likes(sam,chips).
-
-indian(curry).
-indian(dahl).
-indian(tandoori).
-indian(kurma).
-
-mild(dahl).
-mild(tandoori).
-mild(kurma).
-
-chinese(chow_mein).
-chinese(chop_suey).
-chinese(sweet_and_sour).
-
-italian(pizza).
-italian(spaghetti).