If you need help in this direction, consult the excellent Perl reference tutorial in Resources.
如果在这方面需要帮助，请参阅参考资料中精彩的Perl参考教程。
The front half is tutorial, the back half is marked as reference.
书的前一半是教程，后一半明说就是参考。
The questions, topics, and prerequisites for each stage of the game are listed in this tutorial to serve as a reference.
本教程列出了游戏中每一阶段的问题、主题和先决条件，以供参考。
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