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-rw-r--r--prolog/problems/sorting/pivoting_4/common.py15
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diff --git a/prolog/problems/sorting/pivoting_4/common.py b/prolog/problems/sorting/pivoting_4/common.py
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+++ b/prolog/problems/sorting/pivoting_4/common.py
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+id = 124
+group = 'sorting'
+number = 31
+visible = True
+facts = None
+
+solution = '''\
+pivoting(_, [], [], []).
+pivoting(P, [H|T], [H|S], G) :-
+ H =< P,
+ pivoting(P, T, S, G).
+pivoting(P, [H|T], S, [H|G]) :-
+ H > P,
+ pivoting(P, T, S, G).
+'''