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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>2</UnitID><Label>Ending balance</Label></Row><Row FlagID="0"><Id>6</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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 -Name Staff Accounting Bulletin (SAB)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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 -Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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