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a/Allura/allura/lib/diff.py b/Allura/allura/lib/diff.py
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class HtmlSideBySideDiff(object):
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class HtmlSideBySideDiff(object):
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    table_tmpl = '''
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    table_tmpl = '''
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<table class="side-by-side-diff">
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<table class="side-by-side-diff">
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  <thead>
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  <thead>
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    <th colspan="2">%s</th>
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    <th class="lineno"></th>
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    <th colspan="2">%s</th>
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    <th>%s</th>
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    <th class="lineno"></th>
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    <th>%s</th>
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  </thead>
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  </thead>
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%s
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%s
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</table>
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</table>
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'''.strip()
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'''.strip()
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