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diff --git a/prolog/problems/clp_r/max_sum_2/en.py b/prolog/problems/clp_r/max_sum_2/en.py
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+id = 156
+name = 'max_sum/2'
+slug = 'find maximal adjacent elements'
+
+description = '''\
+<p><code>max_sum(List, Max)</code>: <code>Max</code> is the maximal sum of two adjacent elements in <code>List</code>.</p>
+<pre>
+  ?- max_sum([4.5, 3.6, 1.2, 6.7], Max).
+    Max = 8.1.
+  ?- max_sum([1.1, 1.2, -12.3, 8.8], Max).
+    Max = 2.3.
+</pre>'''
+
+hint = {}