Question: who voiced darth maul in the clone wars
[{'answer': 'Samuel Witwer', 'provenance': [{'wikipedia_id': '19008923', 'title': 'Darth Maul', 'start_paragraph_id': 8, 'start_character': 211, 'end_paragraph_id': 8, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Characteristics.:Portrayal.\n'}]}]