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The Vault, Explore, Progress, the Dashboard radar, the command palette, and the practice sidebar group questions by taxonomy area and subject, and a subject's drawer lists the concepts its questions test. Practice gains ?subject= and ?concept=; /?subject= opens a subject; ?topic=, ?area=, and ?q= keep working. Progress looks the subject up from each attempt's question id, so saved progress needs no migration. Chains, the interviewer, plans, and the heat map stay on topic and area.