[MathJax off]

Mohamed Barakat
Email: mohamed.barakat@uni-siegen.de
Homepage: http://www.mathematik.uni-kl.de/~barakat/
Address:
Walter-Flex-Str. 3
57068 Siegen
Germany

Kamal Saleh
Email: kamal.saleh@uni-siegen.de
Homepage: https://github.com/kamalsaleh/
Address:
Walter-Flex-Str. 3
57068 Siegen
Germany

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