Question: who played shaft in the original tv series
[{'answer': 'Richard Roundtree', 'provenance': [{'wikipedia_id': '3969131', 'title': 'Shaft (TV series)', 'start_paragraph_id': 1, 'start_character': 275, 'end_paragraph_id': 1, 'end_character': 292, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3969131', 'title': 'Shaft (TV series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 324, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1565319438783087459}, 'section': 'Section::::Abstract.'}]}]