1
<!ELEMENT problem (desc, include?, solution, case)>
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<!ELEMENT desc (#PCDATA)>
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<!ELEMENT include (#PCDATA)>
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<!ELEMENT solution (#PCDATA)>
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<!ELEMENT case (stdin?, file*, var*)>
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<!ELEMENT stdin (#PCDATA)>
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<!ELEMENT stdout (#PCDATA)>
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<!ELEMENT file (#PCDATA)>
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type (check|norm) #IMPLIED
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<!ELEMENT function (stdout?, file*)>
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default (ignore|match) #REQUIRED