YES
CERTIFIED

Tool output:
YES
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="cpf3HTML.xsl"?><certificationProblem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="cpf3.xsd"><cpfVersion>3.0</cpfVersion><lookupTables><ruleTable><indexToRule><index>1</index><rule><funapp><name>+</name><funapp><name>0</name></funapp><var>y</var></funapp><var>y</var></rule></indexToRule><indexToRule><index>2</index><rule><funapp><name>+</name><funapp><name>s</name><var>x</var></funapp><var>y</var></funapp><funapp><name>s</name><funapp><name>+</name><var>x</var><var>y</var></funapp></funapp></rule></indexToRule><indexToRule><index>3</index><rule><funapp><name>+</name><var>x</var><funapp><name>0</name></funapp></funapp><var>x</var></rule></indexToRule><indexToRule><index>4</index><rule><funapp><name>+</name><var>x</var><funapp><name>s</name><var>y</var></funapp></funapp><funapp><name>s</name><funapp><name>+</name><var>x</var><var>y</var></funapp></funapp></rule></indexToRule></ruleTable></lookupTables><input><trsWithSignature><signature><symbol><name>+</name><arity>2</arity></symbol><symbol><name>0</name><arity>0</arity></symbol><symbol><name>s</name><arity>1</arity></symbol></signature><trs><rules><ruleIndex>1</ruleIndex><ruleIndex>2</ruleIndex><ruleIndex>3</ruleIndex><ruleIndex>4</ruleIndex></rules></trs></trsWithSignature></input><property><confluence/></property><answer><yes/></answer><proof><crProof><developmentClosed><joinAutoBfs>-1</joinAutoBfs></developmentClosed></crProof></proof><metaInformation><toolInfos><toolInfo>ACP</toolInfo><toolInfo>version: 0.73</toolInfo></toolInfos></metaInformation></certificationProblem>