Question: how many branches of the federal reserve system were established to operate across the country
[{'answer': 'twelve', 'provenance': [{'wikipedia_id': '178805', 'title': 'Federal Reserve Bank', 'start_paragraph_id': 1, 'start_character': 132, 'end_paragraph_id': 1, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '178805', 'title': 'Federal Reserve Bank', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 199, 'bleu_score': 0.6248140881877581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3182135648466247801}, 'section': 'Section::::Legal status.\n'}]}]