book-4 L3 & L4: lead topics with sentences, not word lists
Regenerated with a stronger guide rule: never open a part with a bare-word drill — lead with a sentence-based presentation, cassette word-drills follow as reinforcement. Also fixed a heard-stimulus defect (duplicate PROMPT instead of PROMPT+RESPONSE) in the dictation and demonstrative cloze. Both 100% cassette coverage. Co-authored-by: Cursor <cursoragent@cursor.com>
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