[PerlChina] interesting exam

[Joe Jiang]

抱歉不记得怎么得到这个 PDF 文档的了，整理笔记本的时候偶然发现，和大家分享。也预祝明天的聚会满有成效 :)

可以当作一个小小的自测题，休息的时候做做看。
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God May Always Inspire Life => Gmail
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