Question: when was the printing press invented in ancient china
[{'answer': 'before the 8th century CE', 'provenance': [{'wikipedia_id': '7643744', 'title': 'History of printing in East Asia', 'start_paragraph_id': 1, 'start_character': 229, 'end_paragraph_id': 1, 'end_character': 254, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7643744', 'title': 'History of printing in East Asia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 593, 'bleu_score': 0.965998324468304, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11940551905730816951}, 'section': 'Section::::Abstract.'}]}]