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<section id="SigmodSpeciali">
  <title>Specialized Filters</title>

  <para>
    The opcodes that recreate specialized filters are
    <link linkend="dcblock"><citetitle>dcblock</citetitle></link>,
    <link linkend="nlfilt"><citetitle>nlfilt</citetitle></link>, and
    <link linkend="pareq"><citetitle>pareq</citetitle></link>.
  </para>

</section>
