Data commit

Task/Unicode-variable-names/Prolog/unicode-variable-names-1.pro

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+% Unicode in predicate names:
+是.            % be: means, approximately, "True".
+不是 :- \+ 是.  % not be: means, approximately, "False".  Defined as not 是.
+
+% Unicode in variable names:
+test(Garçon, Δ) :-
+  Garçon = boy,
+  Δ = delta.
+
+% Call test2(1, Result) to have 2 assigned to Result.
+test2(Δ, R) :- R is Δ + 1.

Task/Unicode-variable-names/Prolog/unicode-variable-names-2.pro

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+?- 是.
+true.
+
+?- 不是.
+false.
+
+?- test(X,Y).
+X = boy,
+Y = delta.
+
+?- test2(1,Result).
+Result = 2.