diff options
Diffstat (limited to 'prolog/problems/family_relations/aunt_2/common.py')
| -rw-r--r-- | prolog/problems/family_relations/aunt_2/common.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/prolog/problems/family_relations/aunt_2/common.py b/prolog/problems/family_relations/aunt_2/common.py index 50c82b4..5d633fb 100644 --- a/prolog/problems/family_relations/aunt_2/common.py +++ b/prolog/problems/family_relations/aunt_2/common.py @@ -34,6 +34,7 @@ hint_type = { 'x_need_not_be_parent': Hint('x_need_not_be_parent'), 'y_need_not_be_parent': Hint('y_need_not_be_parent'), 'predicate_always_false': Hint('predicate_always_false'), + 'nephews_parent_can_be_male': Hint('nephews_parent_can_be_male'), } test_cases = [ @@ -96,6 +97,12 @@ def hint(code, aux_code): 'aunt(X, _), male(X)'): return [{'id': 'x_must_be_female'}] + # nephew's parent can also be male + # this mistake comes from: parent(P, Y), sister(P, X)... + if prolog.engine.ask_truth(engine_id, + 'setof(X/Y, aunt(X, Y), [patricia/susan, vanessa/john])'): + return [{'id': 'nephews_parent_can_be_male'}] + # Y must have a parent # perhaps risky as only one such nephew exists in DB (susan) if prolog.engine.ask_truth(engine_id, |