story: [Fletcher] and his brother [Robert] went out for lunch. [Fletcher] had a burger, and [Robert] had a chicken sandwich. [Fletcher] is in the sixth grade. He looks up to his sister [Claire], who is in the seventh. [Fletcher] bought a book for his father [Paul].
query: ('Paul', 'Robert')
clean_story: [Fletcher] bought a book for his father [Paul]. [Fletcher] and his brother [Robert] went out for lunch. [Fletcher] had a burger, and [Robert] had a chicken sandwich.
proof_state: [{('Paul', 'son', 'Robert'): [('Paul', 'son', 'Fletcher'), ('Fletcher', 'brother', 'Robert')]}]