story: [Crystal] and her daughter [Glenna] went out to dinner. [Nancy]'s son, [Fletcher], recently started a pawn shop. [Nancy] is a woman with a sister named [Crystal].
query: ('Crystal', 'Fletcher')
clean_story: [Nancy] is a woman with a sister named [Crystal]. [Nancy]'s son, [Fletcher], recently started a pawn shop.
proof_state: [{('Crystal', 'nephew', 'Fletcher'): [('Crystal', 'sister', 'Nancy'), ('Nancy', 'son', 'Fletcher')]}]