Question: when were the confucian classics first implemented by the chinese government
[{'answer': '681', 'provenance': [{'wikipedia_id': '244479', 'title': 'Imperial examination', 'start_paragraph_id': 23, 'start_character': 3, 'end_paragraph_id': 23, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::History by dynasty.:Tang dynasty and Wu interregnum.\n'}]}, {'provenance': [{'wikipedia_id': '244479', 'title': 'Imperial examination', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 174, 'bleu_score': 0.934334813046729, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17688609682122270947}, 'section': 'Section::::History by dynasty.:Tang dynasty and Wu interregnum.\n'}]}]