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Essays and Essays
This book introduces many "ways of counting" and "units" of familiar things that you want to know as a culture for adults. It not only has basic knowledge about how to count and what units, but also includes anecdotes and anecdotes. There is also a review test at the end so you can check the degree of mastery. By the time you finish reading it, you can learn how to count many things and learn how to use "units".