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Professional word learning system
Lessons from book

Topics WTCD Nature
Lesson Number of words in lesson
Nature 1. (Starter level) 64
Nature 2. (Elementary level) 75
Nature 3. (Pre-Intermediate level) 100
Nature 4. (Intermediate level) 117
Nature 5. (Upper-Intermediate level) 85
Nature 6. (Advanced level) 127

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