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There's a rather good documentary about it here https://www.youtube.com/watch?v=v3XI-4wfYxI https://www.youtube.com/watch?v=v3XI-4wfYxI (in German, unfortunate

by jancs 8y ago

There's a rather good documentary about it here https://www.youtube.com/watch?v=v3XI-4wfYxI https://www.youtube.com/watch?v=v3XI-4wfYxI (in German, unfortunately), for anyone interested in how it operates.