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+# coding=utf-8
+
+name = 'dup/2'
+slug = 'Podvoji vse elemente v seznamu'
+
+description = '''\
+<p><code>dup(L1, L2)</code>: seznam <code>L2</code> dobimo iz <code>L1</code> tako, da podvojimo vsak element.</p>
+<pre>
+ ?- dup([1,2], X).
+ X = [1,1,2,2].
+ ?- dup([1,2,3], X).
+ X = [1,1,2,2,3,3].
+</pre>'''
+
+hint = {}