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<file original="File_1.xml"> <body> ... </unit> </body> </file>
File_1.xml id1 title_value_from_first_xml title_value_from_se +cond_xml File_1.xml id2 title_value_from_first_xml title_value_from_se +cond_xml File_2.xml id1 title_value_from_first_xml title_value_from_se +cond_xml