The series is a popular four-book collection from Seed Learning designed to help intermediate learners master high-frequency vocabulary. These words are chosen based on their common appearance in English textbooks and academic materials.
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The Oxford University Press has defined the Oxford 3000 (for B1 level) and the Oxford 4500 (for B2/C1 level). These are words selected by professional lexicographers based on frequency and usefulness. You will find words like "analyze," "significant," and "consequence" rather than obscure terms like "antidisestablishment." The series is a popular four-book collection from