Zig-zag matrix: Difference between revisions

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=={{header|Prolog}}==
=={{header|Prolog}}==
{{Works with|SWi-Prolog}}
{{Works with|SWI-Prolog}}
<syntaxhighlight lang="prolog">zig_zag(N) :-
<syntaxhighlight lang="prolog">zig_zag(N) :-
zig_zag(N, N).
zig_zag(N, N).