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Build collapsible HTML review trees from concept-heavy slides, lecture decks, PDFs, DOCX notes, or course materials. Use when the source material is dense, abstract, parallel, or terminology-heavy and the goal is to clarify hierarchy, inclusion, contrast, repeated frameworks, or case-to-theory relationships for study and review. Especially useful for business, ethics, law, policy, humanities, social science, and other concept-first courses where linear summaries are less helpful than a structured concept map.