Question: when did the human settlements came about in the nile valley
[{'answer': 'as early as 5500 BCE', 'provenance': [{'wikipedia_id': '9031507', 'title': 'River valley civilization', 'start_paragraph_id': 3, 'start_character': 239, 'end_paragraph_id': 3, 'end_character': 267, 'bleu_score': 0.668740304976422, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '9031507', 'title': 'River valley civilization', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 585, 'bleu_score': 0.7312038875187411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4918940423200590225}, 'section': 'Section::::History.\n'}]}]