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<!DOCTYPE doc [
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<!ELEMENT doc (a, b, c, b, c, d) >
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<!ELEMENT a EMPTY>
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<!ELEMENT b EMPTY>
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<!ELEMENT c EMPTY>
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<!ELEMENT d EMPTY>
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<!ENTITY c "<c/>">
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<!ENTITY bc "<b/>&c;">
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]>
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<doc>
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<a/>
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&bc;
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&bc;
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<d/>
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</doc>
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