Question: who did the voice of linus in charlie brown christmas
[{'answer': 'Chris Shea', 'provenance': [{'wikipedia_id': '113226', 'title': 'A Charlie Brown Christmas', 'start_paragraph_id': 14, 'start_character': 12, 'end_paragraph_id': 14, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Voice cast.\n'}]}, {'provenance': [{'wikipedia_id': '113226', 'title': 'A Charlie Brown Christmas', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 38, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4577260679625344994}, 'section': 'Section::::Voice cast.\n'}]}]