Question: when were the first tombs built in the valley of the kings
[{'answer': '16th to 11th century BC', 'provenance': [{'wikipedia_id': '3036884', 'title': 'Valley of the Kings', 'start_paragraph_id': 1, 'start_character': 157, 'end_paragraph_id': 1, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3036884', 'title': 'Valley of the Kings', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 0.7129070710335821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 184393743461501988}, 'section': 'Section::::Abstract.'}]}]