Workbook files are numbered by the Lesson number, for example, Lesson 001, Lesson 023. Files other than lessons (introductions to parts 1 and 2 and extra reading given with some later lessons) are labelled, for example, Lesson 201 Review, or Lesson 235 Prelude, which means the workbook extra material given with those lessons. They are designed to be read or heard ahead of the accompanying lesson and appear in this order.

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