Question: where did the anglo saxons originally come from
[{'answer': 'Germanic tribes', 'provenance': [{'wikipedia_id': '37780', 'title': 'Anglo-Saxons', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37780', 'title': 'Anglo-Saxons', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 572, 'bleu_score': 0.560342178872413, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16832509686259427030}, 'section': 'Section::::Abstract.'}]}]