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excersise

I need some help with this exercise, I have been struggling a long time to manage it, can someone please help me with how to solve it?

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    $\begingroup$ a) This is not a research level question, so it should not be asked on this site but rather on cs.stackexchange.com b) You should explain the relevant notation and definitions c) You should explain what you have already attempted. $\endgroup$ Jan 10 at 19:56

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