Question: how many trader joe's locations are there
[{'answer': '474', 'provenance': [{'wikipedia_id': '481581', 'title': "Trader Joe's", 'start_paragraph_id': 1, 'start_character': 209, 'end_paragraph_id': 1, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]