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How to solve below problem:
As far as I can see, that is problem 4b of the VRS exam from August 27, 2019. Isn't the solution given in https://es.cs.uni-kl.de/teaching/vrs/exams/2019.08.27.vrs/2019.08.27.vrs.solutions.pdf a sufficient answer to your question? What are you missing there?