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See The “Course Materials” for Answer keys

You are using a 1st edition workbook if the second page of your workbook with the stop sign has no writing in the bottom left-hand corner.

Typo Correction Sheet for all editions: https://docs.google.com/spreadsheets/d/1cWpa6bnC6BbHuWpzCWnlcWohJJuclcinal3IZwbzXww/edit?usp=sharing