Question: who was the voice of francis the talking mule
[{'answer': 'Chill Wills', 'provenance': [{'wikipedia_id': '1852177', 'title': 'Francis the Talking Mule', 'start_paragraph_id': 20, 'start_character': 73, 'end_paragraph_id': 20, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Film series actors.\n'}]}, {'provenance': [{'wikipedia_id': '1852177', 'title': 'Francis the Talking Mule', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 374, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4034596450371973767}, 'section': 'Section::::Film series actors.\n'}]}]