Question: where did most sumerians live after about 3000 bc
[{'answer': 'Sumer', 'provenance': [{'wikipedia_id': '50521', 'title': 'Sumer', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50521', 'title': 'Sumer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 609, 'bleu_score': 0.7246530377668731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8950745978283426575}, 'section': 'Section::::Abstract.'}]}]