Question: what is the purpose of a tax treaty
[{'answer': 'avoid or mitigate double taxation', 'provenance': [{'wikipedia_id': '446274', 'title': 'Tax treaty', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '446274', 'title': 'Tax treaty', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 801, 'bleu_score': 0.9643025203494101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4170160574481757960}, 'section': 'Section::::Abstract.'}]}]