Question: where does a law that is cited as 47 cfr 300 come from
[{'answer': 'the Code of Federal Regulations', 'provenance': [{'wikipedia_id': '27552742', 'title': 'Law of the United States', 'start_paragraph_id': 19, 'start_character': 416, 'end_paragraph_id': 19, 'end_character': 447, 'bleu_score': 1.0, 'section': 'Section::::Levels of law.:Federal law.\n'}]}, {'provenance': [{'wikipedia_id': '27552742', 'title': 'Law of the United States', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 486, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3754503581466042503}, 'section': 'Section::::Levels of law.:Federal law.:Regulations.\n'}]}]