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1.1 misho 1: <!DOCTYPE doc [
2: <!ELEMENT doc ((a | b) , (c | d))+>
3: <!ELEMENT a (#PCDATA)>
4: <!ELEMENT b (#PCDATA)>
5: <!ELEMENT c (#PCDATA)>
6: <!ELEMENT d (#PCDATA)>
7: ]>
8: <doc><b>This</b><c> is a valid document</c></doc>