[MathJax on]

Mohamed Barakat
Email: mohamed.barakat@uni-siegen.de
Homepage: https://mohamed-barakat.github.io
Address:
Walter-Flex-Str. 3
57068 Siegen
Germany

Tibor Grün
Email: tibor.gruen@student.uni-siegen.de
Homepage: https://github.com/Tschitschibor
Address:
Walter-Flex-Str. 3
57068 Siegen
Germany

Peter Webb
Email: webb@math.umn.edu
Homepage: https://www-users.math.umn.edu/~webb
Address:
School of Mathematics,
University of Minnesota,
Minneapolis, MN 55455

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