记录文档的过程稍微有点凌乱和困难，但是使用xf:distinct ，这会变的很容易，如 清单4所示
A bit messy and difficult to document, however using xf:distinct, this becomes easy, as shown in Listing 4
youdao
这一切都变的很凌乱。
It's turned into a very messy business.
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