https://www.tkn.tu-berlin.de/teaching/rn/animations/propagation/
--https://www.youtube.com/watch?v=wo3M5G9ZHo0
--https://www.youtube.com/watch?v=vPCKWhXSAEo
--https://www.youtube.com/watch?v=wo3M5G9ZHo0
--https://www.youtube.com/watch?v=vPCKWhXSAEo
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