Question: who were the voices of the seven dwarfs
[{'answer': 'Roy Atwell', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 15, 'start_character': 12, 'end_paragraph_id': 15, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Pinto Colvig', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 28, 'start_character': 501, 'end_paragraph_id': 28, 'end_character': 513, 'bleu_score': 1.0, 'section': 'Section::::Production.:Story development.\n'}]}, {'answer': 'Otis Harlan', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 17, 'start_character': 12, 'end_paragraph_id': 17, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Scotty Mattraw', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 18, 'start_character': 12, 'end_paragraph_id': 18, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Billy Gilbert', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 19, 'start_character': 12, 'end_paragraph_id': 19, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Eddie Collins', 'provenance': [{'wikipedia_id': '76361', 'title': 'Snow White and the Seven Dwarfs (1937 film)', 'start_paragraph_id': 20, 'start_character': 12, 'end_paragraph_id': 20, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]