Question: when did mike she schefsky start coaching at duke
[{'answer': 'March 18 , 1980', 'provenance': [{'wikipedia_id': '421034', 'title': 'Mike Krzyzewski', 'start_paragraph_id': 13, 'start_character': 3, 'end_paragraph_id': 13, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Coaching career.:Duke.\n'}]}, {'provenance': [{'wikipedia_id': '421034', 'title': 'Mike Krzyzewski', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 767, 'bleu_score': 0.7850251548259061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9698308951875440801}, 'section': 'Section::::Coaching career.:Duke.\n'}]}]