YES
<?xml version="1.0" encoding="UTF-8" standalone="no"?><?xml-stylesheet type="text/xsl" href="cpfHTML.xsl"?><certificationProblem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="cpf.xsd"><input><trsInput><trs><rules><rule><lhs><funapp><name>a__f</name><arg><funapp><name>a</name></funapp></arg><arg><funapp><name>b</name></funapp></arg><arg><var>X</var></arg></funapp></lhs><rhs><funapp><name>a__f</name><arg><var>X</var></arg><arg><var>X</var></arg><arg><funapp><name>mark</name><arg><var>X</var></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>a__c</name></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>a__c</name></funapp></lhs><rhs><funapp><name>b</name></funapp></rhs></rule><rule><lhs><funapp><name>mark</name><arg><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a__f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><funapp><name>mark</name><arg><var>X3</var></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>mark</name><arg><funapp><name>c</name></funapp></arg></funapp></lhs><rhs><funapp><name>a__c</name></funapp></rhs></rule><rule><lhs><funapp><name>mark</name><arg><funapp><name>a</name></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>mark</name><arg><funapp><name>b</name></funapp></arg></funapp></lhs><rhs><funapp><name>b</name></funapp></rhs></rule><rule><lhs><funapp><name>a__f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></lhs><rhs><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></rhs></rule><rule><lhs><funapp><name>a__c</name></funapp></lhs><rhs><funapp><name>c</name></funapp></rhs></rule></rules></trs><strategy><innermost/></strategy></trsInput></input><cpfVersion>2.1</cpfVersion><proof><trsTerminationProof><dpTrans><dps><rules><rule><lhs><funapp><sharp><name>a__f</name></sharp><arg><funapp><name>a</name></funapp></arg><arg><funapp><name>b</name></funapp></arg><arg><var>X</var></arg></funapp></lhs><rhs><funapp><sharp><name>a__f</name></sharp><arg><var>X</var></arg><arg><var>X</var></arg><arg><funapp><name>mark</name><arg><var>X</var></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>a__f</name></sharp><arg><funapp><name>a</name></funapp></arg><arg><funapp><name>b</name></funapp></arg><arg><var>X</var></arg></funapp></lhs><rhs><funapp><sharp><name>mark</name></sharp><arg><var>X</var></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>a__f</name></sharp><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><funapp><name>mark</name><arg><var>X3</var></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>mark</name></sharp><arg><var>X3</var></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>c</name></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>a__c</name></sharp></funapp></rhs></rule></rules></dps><markedSymbols>true</markedSymbols><dpProof><depGraphProc><component><dps><rules><rule><lhs><funapp><sharp><name>a__f</name></sharp><arg><funapp><name>a</name></funapp></arg><arg><funapp><name>b</name></funapp></arg><arg><var>X</var></arg></funapp></lhs><rhs><funapp><sharp><name>mark</name></sharp><arg><var>X</var></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>a__f</name></sharp><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><funapp><name>mark</name><arg><var>X3</var></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>f</name><arg><var>X1</var></arg><arg><var>X2</var></arg><arg><var>X3</var></arg></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>mark</name></sharp><arg><var>X3</var></arg></funapp></rhs></rule></rules></dps><realScc>true</realScc><dpProof><redPairProc><orderingConstraintProof><redPair><pathOrder><statusPrecedence><statusPrecedenceEntry><sharp><name>a__f</name></sharp><arity>3</arity><precedence>1</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>a</name><arity>0</arity><precedence>2</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>b</name><arity>0</arity><precedence>0</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><sharp><name>mark</name></sharp><arity>1</arity><precedence>0</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>f</name><arity>3</arity><precedence>1</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>a__f</name><arity>3</arity><precedence>1</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>c</name><arity>0</arity><precedence>2</precedence><lex/></statusPrecedenceEntry><statusPrecedenceEntry><name>a__c</name><arity>0</arity><precedence>2</precedence><lex/></statusPrecedenceEntry></statusPrecedence><argumentFilter><argumentFilterEntry><sharp><name>a__f</name></sharp><arity>3</arity><nonCollapsing><position>3</position></nonCollapsing></argumentFilterEntry><argumentFilterEntry><name>a</name><arity>0</arity><nonCollapsing/></argumentFilterEntry><argumentFilterEntry><name>b</name><arity>0</arity><nonCollapsing/></argumentFilterEntry><argumentFilterEntry><sharp><name>mark</name></sharp><arity>1</arity><nonCollapsing><position>1</position></nonCollapsing></argumentFilterEntry><argumentFilterEntry><name>f</name><arity>3</arity><nonCollapsing><position>3</position></nonCollapsing></argumentFilterEntry><argumentFilterEntry><name>mark</name><arity>1</arity><collapsing>1</collapsing></argumentFilterEntry><argumentFilterEntry><name>a__f</name><arity>3</arity><nonCollapsing><position>3</position></nonCollapsing></argumentFilterEntry><argumentFilterEntry><name>c</name><arity>0</arity><nonCollapsing/></argumentFilterEntry><argumentFilterEntry><name>a__c</name><arity>0</arity><nonCollapsing/></argumentFilterEntry></argumentFilter></pathOrder></redPair></orderingConstraintProof><dps><rules/></dps><dpProof><pIsEmpty/></dpProof></redPairProc></dpProof></component><component><dps><rules><rule><lhs><funapp><sharp><name>a__f</name></sharp><arg><funapp><name>a</name></funapp></arg><arg><funapp><name>b</name></funapp></arg><arg><var>X</var></arg></funapp></lhs><rhs><funapp><sharp><name>a__f</name></sharp><arg><var>X</var></arg><arg><var>X</var></arg><arg><funapp><name>mark</name><arg><var>X</var></arg></funapp></arg></funapp></rhs></rule></rules></dps><realScc>false</realScc></component><component><dps><rules><rule><lhs><funapp><sharp><name>mark</name></sharp><arg><funapp><name>c</name></funapp></arg></funapp></lhs><rhs><funapp><sharp><name>a__c</name></sharp></funapp></rhs></rule></rules></dps><realScc>false</realScc></component></depGraphProc></dpProof></dpTrans></trsTerminationProof></proof><origin><proofOrigin><tool><name>AProVE</name><version>AProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty
</version><strategy>Statistics for single proof: 100.00 % (4 real / 0 unknown / 0 assumptions / 4 total proof steps)</strategy><url>http://aprove.informatik.rwth-aachen.de</url></tool><toolUser><firstName>John</firstName><lastName>Doe</lastName></toolUser></proofOrigin><inputOrigin/></origin></certificationProblem>