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Continue to ChatCPAN modules for checking credit card numbers (LUHN check) https://wp.jochen.hayek.name/blog-en/2012/08/13/cpan-modules-for-checking-credit-card-numbers-luhn-check/
CPAN modules for checking credit card numbers (LUHN check) https://wp.jochen.hayek.name/blog-en/2012/08/13/cpan-modules-for-checking-credit-card-numbers-luhn-check/