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Snap! (formerly BYOB) is a visual, drag-and-drop programming language. It is an extended re-implementation of Scratch (a project of the Lifelong Kindergarten Group at the MIT Media Lab) that allows you to Build Your Own Blocks. It also features first class[1] lists, first class procedures, and continuations[2]. These added capabilities make it suitable for a serious introduction to computer science for high school or college students.