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Continue to Chat4 - 4 - 12 = 1 (Die neue SuS-Formel) https://www.sus-scheidingen.de/2013/10/06/4-4-12-1-die-neue-sus-formel/
4 - 4 - 12 = 1 (Die neue SuS-Formel) https://www.sus-scheidingen.de/2013/10/06/4-4-12-1-die-neue-sus-formel/