Question: who plays lucky ned pepper in true grit
[{'answer': 'Robert Duvall', 'provenance': [{'wikipedia_id': '161912', 'title': 'True Grit (1969 film)', 'start_paragraph_id': 2, 'start_character': 156, 'end_paragraph_id': 2, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '161912', 'title': 'True Grit (1969 film)', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 45, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3268065841219965768}, 'section': 'Section::::Cast.\n'}]}]