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<td>
Emphasize the layered approach (Section 1.5 in book)
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[http://validator.w3.org/check?uri=referer Validate as XHTML 1.0 Transitional] [[Image:<img src="http://www.w3.org/Icons/valid-xhtml10-blue" alt="Valid XHTML 1.0 Transitional" height="31" width="88" />]]
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