story: [Lisa] and her sister [Dorothy] braided each other's hair before school. [Christopher] took his sister [Lisa] out to dinner for her birthday.
query: ('Dorothy', 'Christopher')
clean_story: [Lisa] and her sister [Dorothy] braided each other's hair before school. [Christopher] took his sister [Lisa] out to dinner for her birthday.
proof_state: [{('Dorothy', 'brother', 'Christopher'): [('Dorothy', 'sister', 'Lisa'), ('Lisa', 'brother', 'Christopher')]}]