10 lines
146 B
XML
10 lines
146 B
XML
<!DOCTYPE doc [
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<!ELEMENT doc (a?, (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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]>
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<doc>
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<d/>
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</doc>
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