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diff --git a/prolog/problems/sets/union_3/sl.py b/prolog/problems/sets/union_3/sl.py
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+++ b/prolog/problems/sets/union_3/sl.py
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+# coding=utf-8
+
+name = 'union/3'
+slug = 'Poišči unijo dveh množic'
+
+description = '''\
+<p><code>union(S1, S2, U)</code>: seznam <code>U</code> predstavlja unijo elementov v seznamih <code>S1</code> in <code>S2</code>, duplikatov (kot se za množice spodobi) ni.</p>
+<pre>
+  ?- union([1,5,2,3], [3,4,8,2], U).
+    U = [1,5,3,4,8,2].
+</pre>'''
+
+hint = {}