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<!DOCTYPE doc
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[
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<!ELEMENT doc ANY>
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<!ELEMENT a (doc)>
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<!ELEMENT b ((doc|a?))>
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<!ELEMENT c ((a,b))>
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<!ELEMENT d (doc*)>
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<!ELEMENT e (doc+)>
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<!ELEMENT f (doc?)>
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<!ELEMENT g ((a,b)*)>
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<!ELEMENT h ((a,b)?)>
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<!ELEMENT i ((a,b)+)>
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]>
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<doc/> |