Question: how many supreme court justices serve on the supreme court
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '3047164', 'title': 'Demographics of the Supreme Court of the United States', 'start_paragraph_id': 29, 'start_character': 202, 'end_paragraph_id': 29, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Geographic background.\n'}]}, {'provenance': [{'wikipedia_id': '3047164', 'title': 'Demographics of the Supreme Court of the United States', 'start_paragraph_id': 119, 'start_character': 0, 'end_paragraph_id': 119, 'end_character': 1267, 'bleu_score': 0.9905879735111871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1782764107813511194}, 'section': 'Section::::Financial means.\n'}]}]