The system consists of a knowledge base and three subprograms.
该系统由一个知识库和三个子程序组成。
For regular graphs, the plotting program set is built up upon level structure of subprograms;
对于有规则的图形，用子程序分层结构，建立绘图程序组；
For regular graphs, the plotting program set is built up upon level structure of subprograms;
对于有规则的图形，用子程序分层结构，建立绘图程序组；
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