Every report item line is printed exactly once.
每一个报告项都严格只打印一次。
As you can see, a line is printed for each book block.
可以看到，每个图书块输出一行。
Proof that every report item line is printed exactly once.
证明每一个报告项都严格只打印一次。
The last line on this page hasn't been properly printed.
这一页的最后一行没有印好。
The last line on this page hasn't been properly printed.
这一页的最后一行没有印好。
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