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-rw-r--r--prolog/problems/lists/conc_3/common.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/prolog/problems/lists/conc_3/common.py b/prolog/problems/lists/conc_3/common.py
index 82b700f..0c5312f 100644
--- a/prolog/problems/lists/conc_3/common.py
+++ b/prolog/problems/lists/conc_3/common.py
@@ -6,7 +6,7 @@ import server.problems
id = 104
number = 12
-visible = True
+visible = False
facts = None
solution = '''\