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This text on Programming Languages is intended to introduce you to new ways of thinking about programming. Typically, computer science students start out learning to program in an imperative model of programming where variables are created and updated as a program executes. There are other ways to program. As you learn to program in these new paradigms you will begin to understand that there are different ways of thinking about problem solving. Each paradigm is useful in some contexts. This book is not meant to be a survey of lots of different languages. Rather, its purpose is to introduce you to the three styles of programming languages by using them to implement a non-trivial programming language.