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<frameset cols="33%,33%,33%">
  <frame src="1.htm" name="links">
  <frameset rows="66%,33%">
    <frame src="2.htm" name="mitteoben">
    <frame src="3.htm" name="mitteunten">
  </frameset>
  <frame src="4.htm" name="rechts">
</frameset>