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<!DOCTYPE html>
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<style>
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/* In border-collapse mode, inset becomes ridge. */
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table { border-collapse: collapse; border-spacing: 0 }
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table, td { border-style: inset; }
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td { border-width: 20px; width: 100px; height: 100px}
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</style>
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<table>
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<tr>
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<td></td>
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</tr>
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</table>
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