Question: where does slate come from in the uk
[{'answer': 'Cornwall', 'provenance': [{'wikipedia_id': '5389577', 'title': 'Slate industry', 'start_paragraph_id': 1, 'start_character': 423, 'end_paragraph_id': 1, 'end_character': 431, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Devon', 'provenance': [{'wikipedia_id': '5389577', 'title': 'Slate industry', 'start_paragraph_id': 43, 'start_character': 45, 'end_paragraph_id': 43, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Other slate producing areas in Great Britain.\n'}]}, {'provenance': [{'wikipedia_id': '5389577', 'title': 'Slate industry', 'start_paragraph_id': 43, 'start_character': 0, 'end_paragraph_id': 43, 'end_character': 440, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8326998891190676964}, 'section': 'Section::::Other slate producing areas in Great Britain.\n'}]}]