Implemented the Debug trait for all data structures
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@@ -9,7 +9,7 @@ between(Lower, Upper, X) :-
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must_be(integer, Lower),
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must_be(integer, Upper),
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can_be(integer, X),
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between_(Lower, Upper, X).
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between_(Lower, Upper, X).
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between_(Lower, Upper, Lower) :-
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Lower =< Upper.
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