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Algorithm::CheckDigits::M11_013(3pm) on Linux

The text 027268809737, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.

compute check digits for VAT Registration Number (GR)

Algorithm::CheckDigits::M11_013(3pm) on Linux now