story: [Paul] was waiting patiently for his wife, [Nancy]. [Nancy] has a son named [Jess]. [Nancy] has a son called [Robert]. Each day they go to the park after school.
query: ('Paul', 'Robert')
clean_story: [Paul] was waiting patiently for his wife, [Nancy]. [Nancy] has a son called [Robert]. Each day they go to the park after school.
proof_state: [{('Paul', 'son', 'Robert'): [('Paul', 'wife', 'Nancy'), ('Nancy', 'son', 'Robert')]}]