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@anytizer
Created December 21, 2013 14:45
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Verify numbers
check digits
http://www.augustana.ab.ca/~mohrj/algorithms/checkdigit.html
Check Digit Algorithm
https://wiki.openmrs.org/display/docs/Check+Digit+Algorithm
http://www.codeproject.com/Articles/16540/Error-Detection-Based-on-Check-Digit-Schemes
Damm algorithm
http://en.wikipedia.org/wiki/Damm_algorithm
http://web.eecs.umich.edu/~bartlett/credit_card_number.html
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