Question: when was the first step pyramid built in egypt
[{'answer': 'during the 27th century BC', 'provenance': [{'wikipedia_id': '113090', 'title': 'Pyramid of Djoser', 'start_paragraph_id': 1, 'start_character': 278, 'end_paragraph_id': 1, 'end_character': 304, 'bleu_score': 0.707106781186547, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '113090', 'title': 'Pyramid of Djoser', 'start_paragraph_id': 1, 'start_character': 12, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 0.6953624236510181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1393722987360369537}, 'section': 'Section::::Abstract.'}]}]