Question: where is white matter located in spinal cord
[{'answer': 'superficial parts', 'provenance': [{'wikipedia_id': '33234', 'title': 'White matter', 'start_paragraph_id': 11, 'start_character': 67, 'end_paragraph_id': 11, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Location.\n'}]}, {'provenance': [{'wikipedia_id': '33234', 'title': 'White matter', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 359, 'bleu_score': 0.918221068290973, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17528708932735648903}, 'section': 'Section::::Structure.:Location.\n'}]}]