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Adding class "Klausur"

Next Step: Moving Code Snippets from "Main" and "Eingabe" to form new class
Adding class "Klausur" / Accomplished

Next Step: Moving Code Snippets from "Main" and "Eingabe" to form new class / TO-DO
Adding class "Klausur" / Accomplished

Next Step: Moving Code Snippets from "Main" and "Eingabe" to form new class / TO-DO 2
Merge origin/master