Question: where are the legislative branch powers derived from
[{'answer': 'the United States Constitution', 'provenance': [{'wikipedia_id': '28561', 'title': 'Separation of powers', 'start_paragraph_id': 19, 'start_character': 109, 'end_paragraph_id': 19, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::History.:Checks and balances.\n'}]}, {'provenance': [{'wikipedia_id': '28561', 'title': 'Separation of powers', 'start_paragraph_id': 114, 'start_character': 0, 'end_paragraph_id': 114, 'end_character': 607, 'bleu_score': 0.979484453366057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10346946634367264595}, 'section': 'Section::::Comparison between tripartite and bipartite national systems.:Three branches.:United States.\n'}]}]