The best answer to the question "What is the title of the book that includes both theater and guan?" would depend on the specific context in which this question was asked. However, based on the given information, we can make some assumptions about what the title might be.

Firstly, the title should include both 'theater' and 'guan'. 'Guan' refers to the Chinese character for 'candle', which has a similar pronunciation as 'gou', which means 'to shine'. Therefore, the title could potentially refer to a book that discusses the relationship between light and darkness, or how these two concepts intersect in the world of theater.

Secondly, the title should be concise and encompass both theater and guan. A title that includes both 'theater' and 'guan' may seem like a bit of a mouthful, but it could also be easily remembered by readers who know what it means.

Finally, the title should not be too long or complicated. While a title that includes both 'theater' and 'guan' may sound interesting, it could also be confusing if it's too long or complex. Therefore, a more concise title that still conveys the same message would be preferred.

In conclusion, the best answer to the question "What is the title of the book that includes both theater and guan?" would be a title that includes both 'theater' and 'guan', while also being concise and easy to remember. The title could refer to a book that discusses the relationship between light and darkness, or how these two concepts intersect in the world of theater.

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