Which version of excel are you using? I'm confused as to why you have a mix of html and word xml.
Would normally advise populating a table in a second worksheet node.
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<?xml version="1.0"?>
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<?mso-application progid="Excel.Sheet"?>
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<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40">
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<Worksheet ss:Name="Sheet1">
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<Table ss:ExpandedColumnCount="1" ss:ExpandedRowCount="1" x:FullColumns="1" x:FullRows="1">
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<Row>
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<Cell>
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<Data ss:Type="String">Sheet1Data</Data>
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</Cell>
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</Row>
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</Table>
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</Worksheet>
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<Worksheet ss:Name="Sheet2">
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<Table ss:ExpandedColumnCount="1" ss:ExpandedRowCount="1" x:FullColumns="1" x:FullRows="1">
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<Row>
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<Cell>
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<Data ss:Type="String">Sheet2Data</Data>
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</Cell>
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</Row>
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</Table>
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</Worksheet>
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</Workbook>
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