Question: Ten little Niggers, in American reprints and adaptations were all retitled "And Then There Were None", after the last five words in the nursery rhyme that has a roud folk song index number of what?
{'answer': '13512', 'supporting_facts': [['And Then There Were None', 0], ['And Then There Were None', 1], ['And Then There Were None', 2], ['Ten Little Indians', 0], ['Ten Little Indians', 1]]}