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    <title>Anatomy of Credit Card Numbers</title>
    <dc:date>2009-04-15T10:39:13+00:00</dc:date>
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    <dc:creator>sweeney</dc:creator><description><![CDATA[For a card with an even number of digits, double every odd numbered digit and subtract 9 if the product is greater than 9. Add up all the even digits as well as the doubled-odd digits, and the result must be a multiple of 10 or it's not a valid card. If the card has an odd number of digits, perform the same addition doubling the even numbered digits instead.]]></description>
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    <title>Validating a Credit Card Number with JavaScript | evolt.org</title>
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