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Curated sets organized by CEFR level, exam, and theme — same titles, subtitles, and Firestore collections as the Atlas app.

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CEFRLevelsIntermediate through Word Master — /library/levels/…TestsExamsIELTS, TOEFL, SAT, GRE — /library/exams/…TopicsThemesBusiness, feelings, phrasal verbs — /library/themes/…FluencyIdioms100 sets · study + exercises (live)