From the above code, write an implementation of class a.
从上边的源代码开始，写一个完整的类a。
It actually incorporates some of the (open source) code from Calibre, above.
事实上，它从Calibre整合了一部分开源代码，以上。
The sample code from above can therefore be changed in the following two ways
因此上面的示例代码可以用如下两种方式进行修改
The code can still be downloaded from the same link as above.
代码仍然可以从网上下载同一链接如上。
The code can still be downloaded from the same link as above.
代码仍然可以从网上下载同一链接如上。
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