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<?xml version="1.0"?>
<api>
  <query>
    <random>
      <page id="480" ns="0" title="Estática (Fis 151/Fis 1513)" />
      <page id="340" ns="0" title="Ondas Estacionarias en 1-D (Fiz0312)" />
    </random>
  </query>
</api>