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Overview: Topics ? what this book is about, ? its intended audience, ? what the reader ought to know, ? how the book is organized, ? acknowledgements. Specifications express information about a program that is not normally part of the program, and often cannot be expressed in a programming lan- guage. In the past, the word "specification" has sometimes been used to refer to somewhat vague documentation written in English. But today it indicates a precise statement, written in a machine processable language, about the purpose and behavior of a program. Specifications are written in languages th
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