Question: when was the constitution of south africa completed
[{'answer': '4 February 1997', 'provenance': [{'wikipedia_id': '441610', 'title': 'Constitution of South Africa', 'start_paragraph_id': 1, 'start_character': 479, 'end_paragraph_id': 1, 'end_character': 494, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '441610', 'title': 'Constitution of South Africa', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 538, 'bleu_score': 0.84142810206687, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6890834297136636909}, 'section': 'Section::::Abstract.'}]}]