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Abstract
Although A lgol 60 has been uniquely influential in programming language design, its descendants have been significantly different than their prototype. In this paper, we enumerate the principles that we believe embody the essence of A lgol , describe a model that satisfies these principles, and illustrate this model with a language that, while more uniform and general, retains the character of A lgol . These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.