Question: what level is purple belt in jiu jitsu
[{'answer': 'intermediate adult ranking', 'provenance': [{'wikipedia_id': '25061050', 'title': 'Brazilian jiu-jitsu ranking system', 'start_paragraph_id': 15, 'start_character': 19, 'end_paragraph_id': 15, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Adult belt ranks.:Purple belt.\n'}]}, {'provenance': [{'wikipedia_id': '25061050', 'title': 'Brazilian jiu-jitsu ranking system', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 235, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16395973819959713243}, 'section': 'Section::::Adult belt ranks.:Purple belt.\n'}]}]