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-rw-r--r--prolog/problems/trees/common.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/prolog/problems/trees/common.py b/prolog/problems/trees/common.py
index a519878..d9ebca1 100644
--- a/prolog/problems/trees/common.py
+++ b/prolog/problems/trees/common.py
@@ -1,2 +1,4 @@
id = 6
number = 5
+
+allowed_groups = ['lists']