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<!-- This is a comment -->
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<!DOCTYPE doc [<!ATTLIST e9 attr CDATA "default">]>
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<e3 name = "elem3" id="elem3" />
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<e4 name="elem4" id="elem4" ></e4>
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<e5 a:attr="out" b:attr="sorted" attr2="all" attr="I'm"
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xmlns:b="http://www.ietf.org"
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xmlns:a="http://www.w3.org"
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xmlns="http://example.org"/>
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<e6 xmlns="" xmlns:a="http://www.w3.org">
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<e7 xmlns="http://www.ietf.org">
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<e8 xmlns="" xmlns:a="http://www.w3.org">
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<e9 xmlns="" xmlns:a="http://www.ietf.org"/>