Question: what did they use to build the great wall of china
[{'answer': 'rammed earth', 'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 13, 'start_character': 866, 'end_paragraph_id': 13, 'end_character': 878, 'bleu_score': 1.0, 'section': 'Section::::History.:Early walls.\n'}]}, {'answer': 'stones', 'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 16, 'start_character': 1052, 'end_paragraph_id': 16, 'end_character': 1058, 'bleu_score': 1.0, 'section': 'Section::::History.:Ming era.\n'}]}, {'answer': 'wood', 'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 36, 'start_character': 89, 'end_paragraph_id': 36, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Characteristics.\n'}]}, {'answer': 'bricks', 'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 16, 'start_character': 107, 'end_paragraph_id': 16, 'end_character': 113, 'bleu_score': 1.0, 'section': 'Section::::History.:Ming era.\n'}]}, {'answer': 'materials such as tiles , lime , and stone'}, {'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 1235, 'bleu_score': 0.9398386496180811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13416417361787723753}, 'section': 'Section::::Characteristics.\n'}]}]