Question: how many states does amazon collect sales tax
[{'answer': '45', 'provenance': [{'wikipedia_id': '31105432', 'title': 'Amazon tax', 'start_paragraph_id': 2, 'start_character': 320, 'end_paragraph_id': 2, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]