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-rw-r--r--prolog/problems/family_relations/brother_2/common.py8
1 files changed, 4 insertions, 4 deletions
diff --git a/prolog/problems/family_relations/brother_2/common.py b/prolog/problems/family_relations/brother_2/common.py
index 0ad74c3..87f27a3 100644
--- a/prolog/problems/family_relations/brother_2/common.py
+++ b/prolog/problems/family_relations/brother_2/common.py
@@ -65,6 +65,10 @@ def hint(code, aux_code):
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
+ # target predicate seems to always be false
+ if not prolog.engine.ask_truth(engine_id, 'brother(_, _)'):
+ return [{'id': 'predicate_always_false'}]
+
# X must be male
if prolog.engine.ask_truth(engine_id, 'female(X), brother(X, _)'):
return [{'id': 'x_must_be_male'}]
@@ -83,10 +87,6 @@ def hint(code, aux_code):
if prolog.util.Token('NEQU', '\=') in tokens or prolog.util.Token('NEQA', '=\=') in tokens:
return [{'id': 'neq+_instead_of_neq'}]
- # target predicate seems to always be false
- if prolog.engine.ask_one(engine_id, 'brother(_, _)') == 'false':
- return [{'id': 'predicate_always_false'}]
-
# X and Y must be different
if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id,
'setof(X, (member(X, [william, alessandro, andrew]), brother(X, X)), L), length(L, 3)'):