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<set>
        <bvar>  <ci>x</ci>  </bvar>  
        <bvar>  <ci>y</ci>  </bvar>  
        <bvar>  <ci>z</ci>  </bvar>  
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          <apply> <plus/>
            <apply> <power/> <ci>x</ci> <ci>2</ci> </apply>
            <apply> <power/> <ci>y</ci> <ci>2</ci> </apply>
            <apply> <power/> <ci>z</ci> <ci>2</ci> </apply>
          </apply>
          <cn>1</cn>
         </reln>
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      </set>