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      <p bold="true">0 m does not exist ?</p>
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        <p>wrong freak !</p>
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        <p>recast the system,watch the integrator,just demo in there !</p>
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        <e type="operand">1</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="3">el</e>
        <e type="operand">20</e>
        <e type="operand">Length</e>
        <e type="operand">1</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="3">el</e>
        <e type="operand">2</e>
        <e type="operator" args="1">-</e>
        <e type="operand">2</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="6">mat</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">sys</e>
      </input>
    </plot>
  </region>
  <region id="13" left="18" top="873" width="252" height="27" color="#000000" bgColor="#80ff00" fontSize="10">
    <math decimalPlaces="3">
      <input>
        <e type="operand">Length</e>
      </input>
      <contract>
        <e type="operand">Unit_Graphic</e>
      </contract>
      <result action="numeric">
        <e type="operand">8</e>
        <e type="operand">16.292</e>
        <e type="operand">1</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="4">mat</e>
      </result>
    </math>
  </region>
</regions>