Question: when did the greensboro sit ins take place
[{'answer': '1960', 'provenance': [{'wikipedia_id': '1992984', 'title': 'Greensboro sit-ins', 'start_paragraph_id': 1, 'start_character': 94, 'end_paragraph_id': 1, 'end_character': 98, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1992984', 'title': 'Greensboro sit-ins', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 683, 'bleu_score': 0.9823771291847391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16096003291946395036}, 'section': 'Section::::Abstract.'}]}]