Demo 1 on 18.01.2021 af6832979e0943cd8e3e55d4d1ddd71d

Because the recording wasn't on during the first question, the suggested solution for it is presented lastly, at around 3h 11 min. As the platform doesn't allow to cut and paste the parts to different places, I couldn't make the representation more coherent. So, the second exercise becomes first. There is a break from 1 h 28 min to 1 h 44 min.

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