MAYBE
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="cpfHTML.xsl"?>
<certificationProblem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="cpf.xsd">
 <cpfVersion>2.2</cpfVersion>
 <proof>
  <acTerminationProof>
   <acDependencyPairs>
    <equations>
     <rules>
      <rule>
       <lhs>
        <funapp>
         <name>plus</name>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>plus</name>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>z</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>times</name>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>times</name>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>z</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>times</name>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>times</name>
         <arg>
          <var>y</var>
         </arg>
         <arg>
          <var>x</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>plus</name>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>plus</name>
         <arg>
          <var>y</var>
         </arg>
         <arg>
          <var>x</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
     </rules>
    </equations>
    <dpEquations>
     <rules>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>y</var>
         </arg>
         <arg>
          <var>x</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>z</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>z</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>y</var>
         </arg>
         <arg>
          <var>x</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>y</var>
           </arg>
           <arg>
            <var>z</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
     </rules>
    </dpEquations>
    <dps>
     <rules>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>minus</name></sharp>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>x</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>minus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>div</name></sharp>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>x</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>div</name></sharp>
         <arg>
          <funapp>
           <name>minus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>times</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>div</name></sharp>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>x</var>
           </arg>
          </funapp>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>minus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <var>y</var>
           </arg>
          </funapp>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <sharp>
         <name>plus</name></sharp>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>y</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
     </rules>
    </dps>
    <extensions>
     <rules>
      <rule>
       <lhs>
        <funapp>
         <name>plus</name>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <funapp>
             <name>s</name>
             <arg>
              <var>y</var>
             </arg>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>plus</name>
         <arg>
          <funapp>
           <name>s</name>
           <arg>
            <funapp>
             <name>plus</name>
             <arg>
              <var>x</var>
             </arg>
             <arg>
              <var>y</var>
             </arg>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>times</name>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <funapp>
             <name>0</name>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>times</name>
         <arg>
          <funapp>
           <name>0</name>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>plus</name>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <funapp>
             <name>0</name>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>plus</name>
         <arg>
          <var>x</var>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
      <rule>
       <lhs>
        <funapp>
         <name>times</name>
         <arg>
          <funapp>
           <name>times</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <funapp>
             <name>s</name>
             <arg>
              <var>y</var>
             </arg>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </lhs>
       <rhs>
        <funapp>
         <name>times</name>
         <arg>
          <funapp>
           <name>plus</name>
           <arg>
            <var>x</var>
           </arg>
           <arg>
            <funapp>
             <name>times</name>
             <arg>
              <var>x</var>
             </arg>
             <arg>
              <var>y</var>
             </arg>
            </funapp>
           </arg>
          </funapp>
         </arg>
         <arg>
          <var>_1</var>
         </arg>
        </funapp>
       </rhs>
      </rule>
     </rules>
    </extensions>
    <acDPTerminationProof>
     <acDepGraphProc>
      <component>
       <dps>
        <rules>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>div</name></sharp>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>x</var>
              </arg>
             </funapp>
            </arg>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>div</name></sharp>
            <arg>
             <funapp>
              <name>minus</name>
              <arg>
               <var>x</var>
              </arg>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </rhs>
         </rule>
        </rules>
       </dps>
       <realScc>true</realScc>
       <acDPTerminationProof>
        <acRedPairProc>
         <orderingConstraintProof>
          <redPair>
           <interpretation>
            <type>
             <polynomial>
              <domain><naturals/></domain>
              <degree>1</degree>
             </polynomial>
            </type>
            <interpret>
             <sharp>
             <name>div</name></sharp>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <variable>1</variable>
               </polynomial>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>s</name>
             <arity>1</arity>
             <polynomial>
              <sum>
               <polynomial>
                <variable>1</variable>
               </polynomial>
               <polynomial>
                <coefficient>
                <integer>2</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>minus</name>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <variable>1</variable>
               </polynomial>
               <polynomial>
                <coefficient>
                <integer>1</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <sharp>
             <name>plus</name></sharp>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>div</name>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <sharp>
             <name>times</name></sharp>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>0</name>
             <arity>0</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>1</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>times</name>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <sharp>
             <name>minus</name></sharp>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
            <interpret>
             <name>plus</name>
             <arity>2</arity>
             <polynomial>
              <sum>
               <polynomial>
                <coefficient>
                <integer>0</integer></coefficient>
               </polynomial>
              </sum>
             </polynomial>
            </interpret>
           </interpretation>
          </redPair>
         </orderingConstraintProof>
         <dps>
          <rules>
           <rule>
            <lhs>
             <funapp>
              <sharp>
              <name>div</name></sharp>
              <arg>
               <funapp>
                <name>s</name>
                <arg>
                 <var>x</var>
                </arg>
               </funapp>
              </arg>
              <arg>
               <funapp>
                <name>s</name>
                <arg>
                 <var>y</var>
                </arg>
               </funapp>
              </arg>
             </funapp>
            </lhs>
            <rhs>
             <funapp>
              <sharp>
              <name>div</name></sharp>
              <arg>
               <funapp>
                <name>minus</name>
                <arg>
                 <var>x</var>
                </arg>
                <arg>
                 <var>y</var>
                </arg>
               </funapp>
              </arg>
              <arg>
               <funapp>
                <name>s</name>
                <arg>
                 <var>y</var>
                </arg>
               </funapp>
              </arg>
             </funapp>
            </rhs>
           </rule>
          </rules>
         </dps>
         <usableRules>
          <rules>
           <rule>
            <lhs>
             <funapp>
              <name>minus</name>
              <arg>
               <var>x</var>
              </arg>
              <arg>
               <funapp>
                <name>0</name>
               </funapp>
              </arg>
             </funapp>
            </lhs>
            <rhs>
             <var>x</var>
            </rhs>
           </rule>
           <rule>
            <lhs>
             <funapp>
              <name>minus</name>
              <arg>
               <funapp>
                <name>s</name>
                <arg>
                 <var>x</var>
                </arg>
               </funapp>
              </arg>
              <arg>
               <funapp>
                <name>s</name>
                <arg>
                 <var>y</var>
                </arg>
               </funapp>
              </arg>
             </funapp>
            </lhs>
            <rhs>
             <funapp>
              <name>minus</name>
              <arg>
               <var>x</var>
              </arg>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </rhs>
           </rule>
          </rules>
         </usableRules>
         <acDPTerminationProof>
          <acDepGraphProc>
          </acDepGraphProc>
         </acDPTerminationProof>
        </acRedPairProc>
       </acDPTerminationProof>
      </component>
      <component>
       <dps>
        <rules>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>div</name></sharp>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>x</var>
              </arg>
             </funapp>
            </arg>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>minus</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <var>y</var>
            </arg>
           </funapp>
          </rhs>
         </rule>
        </rules>
       </dps>
       <realScc>false</realScc>
      </component>
      <component>
       <dps>
        <rules>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <funapp>
              <name>s</name>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <var>y</var>
            </arg>
           </funapp>
          </rhs>
         </rule>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <funapp>
              <name>times</name>
              <arg>
               <var>y</var>
              </arg>
              <arg>
               <var>z</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <var>y</var>
            </arg>
           </funapp>
          </rhs>
         </rule>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <funapp>
              <name>times</name>
              <arg>
               <var>y</var>
              </arg>
              <arg>
               <var>z</var>
              </arg>
             </funapp>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <funapp>
              <name>times</name>
              <arg>
               <var>x</var>
              </arg>
              <arg>
               <var>y</var>
              </arg>
             </funapp>
            </arg>
            <arg>
             <var>z</var>
            </arg>
           </funapp>
          </rhs>
         </rule>
         <rule>
          <lhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>x</var>
            </arg>
            <arg>
             <var>y</var>
            </arg>
           </funapp>
          </lhs>
          <rhs>
           <funapp>
            <sharp>
            <name>times</name></sharp>
            <arg>
             <var>y</var>
            </arg>
            <arg>
             <var>x</var>
            </arg>
           </funapp>
          </rhs>
         </rule>
        </rules>
       </dps>
       <realScc>true</realScc>
       <acDPTerminationProof>
        <unknownProof>
         <description>Failed!
         </description>
        </unknownProof>
       </acDPTerminationProof>
      </component>
     </acDepGraphProc>
    </acDPTerminationProof>
   </acDependencyPairs>
  </acTerminationProof>
 </proof>
 <origin>
  <proofOrigin>
   <tool>
    <name>NaTT</name>
    <version>1.7</version>
   </tool>
  </proofOrigin>
 </origin>
</certificationProblem>