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>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x</var></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule></rules></trs></trsInput></input><cpfVersion>2.1</cpfVersion><proof><crProof><compositionalPcps><trsC><rules /></trsC><trsP><rules><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></rhs></rule><rule><lhs><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></lhs><rhs><funapp><name>a</name></funapp></rhs></rule></rules></trsP><joinSequences /><joinSequences><critPairInfo><left><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x1_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><var>x2_1</var></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp><funapp><name>a</name></funapp></intermediateTerms></critPairInfo><critPairInfo><left><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></left><peak><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>g</name><arg><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></right><overlapPositions><positionInTerm><position>1</position><position>1</position><position>1</position></positionInTerm></overlapPositions><intermediateTerms><funapp><name>f</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp><funapp><name>a</name></funapp></intermediateTerms></critPairInfo><critPairInfo><left><funapp><name>g</name><arg><funapp><name>a</name></funapp></arg></funapp></left><peak><funapp><name>g</name><arg><funapp><name>f</name><arg><funapp><name>a</name></funapp></arg></funapp></arg></funapp></peak><right><funapp><name>a</name></funapp></right><overlapPositions><positionInTerm><position>1</position></positionInTerm></overlapPositions><intermediateTerms /></critPairInfo></joinSequences><relativeTerminationProof><ruleRemoval><orderingConstraintProof><redPair><pathOrder><statusPrecedence><statusPrecedenceEntry><name>g</name><arity>1</arity><precedence>2</precedence><lex /></statusPrecedenceEntry><statusPrecedenceEntry><name>a</name><arity>0</arity><precedence>0</precedence><lex /></statusPrecedenceEntry><statusPrecedenceEntry><name>f</name><arity>1</arity><precedence>0</precedence><lex /></statusPrecedenceEntry></statusPrecedence></pathOrder></redPair></orderingConstraintProof><trs><rules /></trs><trs><rules /></trs><relativeTerminationProof><rIsEmpty /></relativeTerminationProof></ruleRemoval></relativeTerminationProof><crProof><orthogonal /></crProof></compositionalPcps></crProof></proof><origin><proofOrigin><tool><name>Hakusan</name><version>0.10</version></tool></proofOrigin></origin></certificationProblem>