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Unit 1 (Chapter 1) Unit 2 (chapters 2 and 3) Unit 3 (chapter 4) Unit 4 (chapter 5) Unit 5 (Chapter 6 and 8.4) Unit 6 (Chapters 8, 9, 7, and 10.1 and .2) Unit 7 (chapters 10.3 and 4, 11 and 12) Unit 8 (chapters 13-16) General Discussion