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<book?id="1">
<name>冰與火之歌</name>
<year>2014</year>
<author>喬治馬丁</author>
<price>89</price>
</book>
<book?id="2">
<name>安徒生童話</name>
<year>2004</year>
<author>喬治馬丁</author>
<price>77</price>
<language>English</language>
</book>
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