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<BOOK>
  <CHAPTER>
...
    ...
  </CHAPTER>
</BOOK>

<BOOK>
  <CHAPTER>
...
  </CHAPTER>
  ...any other matches...
</BOOK>

<BOOK>
  <CHAPTER>
...
  </CHAPTER>
  ...any other matches...
</BOOK>

<BOOK>
  ...any other matches...
</BOOK>