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<books>
  <book lang="en">
    <author>Norman Davies</author>
    <title>Europe</title>
    <isbn>83-246-0069-8</isbn>
  </book>

  <book lang="pl">
    <author>Witold Gombrowicz</author>
    <title>Journal</title>
    <isbn>83-7361-830-9</isbn>
  </book>
</books>
