# Pastebin qgLJRGah
<models xmlns:xi="http://www.w3.org/2001/XInclude">
  <model name="CARRY4">
    <input_ports>
      <port combinational_sink_ports="CO O" name="CIN"/>
      <port combinational_sink_ports="CO O" name="DI"/>
      <port combinational_sink_ports="CO O" name="S"/>
    </input_ports>
    <output_ports>
      <port name="CO"/>
      <port name="O"/>
    </output_ports>
  </model>
</models>