Added grb-online.net
Added grb-online.net

The official homepage of the Gymnasium Riedberg is gymnasium-riedberg.com. The mailing domain used is `grb-online.net`. http://gymnasium-riedberg.de/de/service/downloads/send/3-/2-riedbergonline shows the relation between the two domains. This school also offers informatics as an advanced or basic lesson after the 10th Grade.
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