Question: when was the first written constitution declared in nepal
[{'answer': '1948', 'provenance': [{'wikipedia_id': '8211529', 'title': 'Constitution of Nepal', 'start_paragraph_id': 24, 'start_character': 194, 'end_paragraph_id': 24, 'end_character': 198, 'bleu_score': 1.0, 'section': 'Section::::Previous Constitutions.\n'}]}, {'provenance': [{'wikipedia_id': '8211529', 'title': 'Constitution of Nepal', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 232, 'bleu_score': 0.68214079534881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15421780591342912214}, 'section': 'Section::::Previous Constitutions.\n'}]}]