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-rw-r--r--prolog/problems/lists/last_elem_2/common.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/prolog/problems/lists/last_elem_2/common.py b/prolog/problems/lists/last_elem_2/common.py
index 9e6576f..cb934fc 100644
--- a/prolog/problems/lists/last_elem_2/common.py
+++ b/prolog/problems/lists/last_elem_2/common.py
@@ -93,7 +93,7 @@ def hint(code, aux_code):
return [{'id': '[]_should_not_succeed'}]
# returns a list, not an element as required
- if prolog.engine.ask_truthTO(engine_id, 'last_elem([q], X), is_list(X)'):
+ if prolog.engine.ask_truthTO(engine_id, 'last_elem([qQ], [qQ])'): # 'last_elem([qQ], X), is_list(X)' with ask_one?
return [{'id': 'list_returned'}]
# missing/failed base case