Question: where was surplus grain stored in indus valley cities
[{'answer': 'Mehrgarh', 'provenance': [{'wikipedia_id': '1998254', 'title': 'Granary', 'start_paragraph_id': 4, 'start_character': 41, 'end_paragraph_id': 4, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Early origins.\n'}]}, {'provenance': [{'wikipedia_id': '1998254', 'title': 'Granary', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 306, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6897964362413188946}, 'section': 'Section::::Early origins.\n'}]}]