This diagram models only the logic of a single alternate course, as you can tell by the numbering of the steps on the left side of the diagram.
该图只对单个备选行动过程的逻辑建模，这可以通过序列图左侧所列的步骤编号得知。
Introduction to Algorithms grew out of a course of the same name, known as 6.046 in MIT's course-numbering system.
《算法导论》(Introduction to Algorithms)一书来自于同名的一门课程，即麻省理工学院课程编号系统里的6.046。
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