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Check if CPR numbers conform to modulo 11 check. Note, modulo 11 check was deprecated in 2007.
mod11(cpr)
Character vector of CPR numbers with or without hyphens.
Logical vector of check results, NA if CPR number includes characters (temporary CPR number).
# NOT RUN { mod11(c('1508631111', '1310762222', '2110625629')) # }
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