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diff --git a/python/problems/recursion/sum/sl.py b/python/problems/recursion/sum/sl.py
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+++ b/python/problems/recursion/sum/sl.py
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+import server
+mod = server.problems.load_language('python', 'sl')
+
+id = 20807
+name = 'Vsota seznama'
+
+description = '''\
+<p>
+Napiši funkcijo <code>sum(xs)</code>, ki sešteje elemente vgnezdenega seznama xs.
+Pomagajte si s funkcijo isinstance.</p>
+<pre>
+>>> isinstance([1, 2, 3], list)
+True
+>>> isinstance(1, list)
+False
+>>> sum([])
+0
+>>> sum([1, 2, 3, 4, 5])
+15
+>>> sum([1, [], [2, 3, [4]], 5])
+15
+</pre>
+'''
+
+plan = []
+
+hint = {
+    'final_hint': ['''\
+<p>Program je pravilen! <br>
+</p>
+'''],
+}