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[{"subject": "General reference", "level": 1, "children": [{"subject": "Books", "level": 2, "children": [{"subject": "Great books listed in How to Read a Book", "level": 3}, {"subject": "Great Books of the Western World", "level": 3}, {"subject": "Harvard Classics", "level": 3}]}, {"subject": "General subject outlines (trees of knowledge)", "level": 2, "children": [{"subject": "Taxonomies (trees) of knowledge included within larger works", "level": 3, "children": [{"subject": "Figurative system of human knowledge", "level": 4}, {"subject": "Outline of academic disciplines", "level": 4}, {"subject": "Outline of Knowledge", "level": 4}, {"subject": "Outline of the knowledge of humanity", "level": 4}]}, {"subject": "Subject classification systems", "level": 3, "children": [{"subject": "Academic classification systems", "level": 4, "children": [{"subject": "Fields of doctoral studies (United States)", "level": 5}, {"subject": "Joint Academic Classification of Subjects", "level": 5}]}, {"subject": "Library classification systems", "level": 4, "children": [{"subject": "Bliss bibliographic classification", "level": 5}, {"subject": "Colon classification", "level": 5}, {"subject": "Cutter Expansive Classification", "level": 5}, {"subject": "New Classification Scheme for Chinese Libraries", "level": 5}, {"subject": "Dewey Decimal classes", "level": 5}, {"subject": "Library of Congress Classification", "level": 5}, {"subject": "Universal Decimal Classification", "level": 5}]}]}]}, {"subject": "Knowledge", "level": 2}, {"subject": "Wikipedia", "level": 2}]}, {"subject": "Culture and the arts", "level": 1, "children": {"subject": "", "level": 2, "children": [{"subject": "The arts", "level": 3, "children": [{"subject": "Literature", "level": 4, "children": [{"subject": "Fiction", "level": 5}, {"subject": "Poetry", "level": 5}, {"subject": "Critical theory", "level": 5}]}, {"subject": "Visual arts", "level": 4, "children": [{"subject": "Architecture", "level": 5, "children": 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"Emergency medicine", "level": 4}, {"subject": "Obstetrics", "level": 4}, {"subject": "Trauma and Orthopedics", "level": 4}, {"subject": "Psychiatry", "level": 4, "children": [{"subject": "Autism", "level": 5}, {"subject": "Bipolar disorder", "level": 5}, {"subject": "Psychiatric survivors movement", "level": 5}]}]}, {"subject": "Public health", "level": 3}]}}, {"subject": "History and events", "level": 1, "children": {"subject": "timelines", "level": 2, "children": [{"subject": "Timeline of world history", "level": 3, "children": [{"subject": "timeline", "level": 4, "children": [{"subject": "Colorado prehistory", "level": 5}, {"subject": "Prehistoric technology", "level": 5}]}, {"subject": "timeline", "level": 4, "children": [{"subject": "Ancient West", "level": 5, "children": [{"subject": "timeline", "level": 6, "children": [{"subject": "Ancient Greece", "level": 7}, {"subject": "Ancient Rome", "level": 7}, {"subject": "Classical architecture", "level": 7}]}]}, {"subject": "Ancient 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{"subject": "timeline", "level": 5, "children": [{"subject": "The History of the Decline and Fall of the Roman Empire", "level": 6}]}, {"subject": "Byzantine Empire", "level": 5}, {"subject": "Ottoman Empire", "level": 5}, {"subject": "Soviet Union", "level": 5}]}]}, {"subject": "timelines", "level": 3, "children": [{"subject": "History, by field", "level": 4, "children": [{"subject": "timeline", "level": 5, "children": [{"subject": "History of painting", "level": 6}]}, {"subject": "History of business", "level": 5}, {"subject": "History of geography", "level": 5}, {"subject": "Jewish history", "level": 5}, {"subject": "History of mathematics", "level": 5}, {"subject": "Military history", "level": 5, "children": [{"subject": "Military history by region", "level": 6, "children": [{"subject": "Kazakh military history", "level": 7}, {"subject": "Pakistan military history", "level": 7}, {"subject": "Military history of the People's Republic of China", "level": 7}]}, {"subject": "History of 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{"subject": "Industry", "level": 3}, {"subject": "Law enforcement", "level": 3}, {"subject": "Philosophy", "level": 3}, {"subject": "Politics", "level": 3}, {"subject": "Religion", "level": 3}, {"subject": "Science", "level": 3, "children": [{"subject": "Applied science", "level": 4}, {"subject": "Formal science", "level": 4}, {"subject": "Natural science", "level": 4}, {"subject": "Social science", "level": 4}]}, {"subject": "Sports", "level": 3}, {"subject": "Transport", "level": 3}, {"subject": "Underwater diving", "level": 3, "children": [{"subject": "Underwater divers", "level": 4}, {"subject": "Recreational dive sites", "level": 4}]}, {"subject": "War", "level": 3}]}, {"subject": "Impact of human activity", "level": 2, "children": [{"subject": "Environmentalism", "level": 3, "children": [{"subject": "National parks of the United States", "level": 4, "children": [{"subject": "Glacier National Park", "level": 5}]}]}]}]}, {"subject": "Mathematics and logic", "level": 1, "children": 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"children": [{"subject": "Dinosaurs", "level": 6}]}, {"subject": "Pharmacology", "level": 5}, {"subject": "Physiology", "level": 5}, {"subject": "Zoology", "level": 5}]}, {"subject": "Life forms", "level": 4, "children": [{"subject": "Animals", "level": 5, "children": [{"subject": "Ants", "level": 6}, {"subject": "Gastropods", "level": 6}, {"subject": "Reptiles", "level": 6}, {"subject": "Birds", "level": 6}, {"subject": "Fish", "level": 6, "children": [{"subject": "Sharks", "level": 7}]}]}, {"subject": "Fungi", "level": 5, "children": [{"subject": "Lichens", "level": 6}]}, {"subject": "Extraterrestrial life", "level": 5}]}]}, {"subject": "Physical sciences", "level": 3, "children": [{"subject": "Chemistry", "level": 4, "children": [{"subject": "Organic chemistry", "level": 5}, {"subject": "Water", "level": 5}, {"subject": "Alchemy", "level": 5}]}, {"subject": "Earth science", "level": 4, "children": [{"subject": "Earth", "level": 5}, {"subject": "Geography", "level": 5}, {"subject": 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