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The idea likely started from the observation that (especially for TOEFL iBT, aiming for 100+) requires a broad passive vocabulary — around 8,000–10,000 word families. Someone took this number, combined it with popular wordlists (like Barron's 800 , Kaplan's 400 , McGraw-Hill's 4000 ), and aggregated them into unofficial "10,000 word" PDFs . 10000 toefl words pdf