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1<!ENTITY % a SYSTEM "http://example.org/a/a.dtd"> 2%a; 3<!ENTITY % b SYSTEM "http://example.org/b/b.dtd"> 4%b; 5<!ENTITY % c SYSTEM "http://example.org/c/c.dtd"> 6%c; 7<!ELEMENT abc (a, b, c)> 8