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This module calculates the Modulus 10 Double Add Double checksum, also known
as the LUHN Formula. This algorithm is used to verify credit card numbers and
Standard & Poor's security identifiers such as CUSIP and CSIN.
You can find plenty of information about the algorithm by searching the web
for "modulus 10 double add double".
WWW: http://search.cpan.org/dist/Algorithm-LUHN/
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