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<!DOCTYPE doc [
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<!ELEMENT doc ((a | b) , (c | d))+>
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<!ELEMENT a (#PCDATA)>
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<!ELEMENT b (#PCDATA)>
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<!ELEMENT c (#PCDATA)>
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<!ELEMENT d (#PCDATA)>
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]>
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<doc><b>This</b><c> is a valid document</c></doc>
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