Thank you so much! It was fun reading all this and it's very useful to get an introduction into a new field of research.

All the best
Paul

PS:Not sure if it was mentioned before, but I noticed to tiny errors: In the table @ f) it's 17 instead of 16
Graphic 12c) is the same as b), but it's obvious what it should look like
(This is not the reason for the post - I just wanted to say thank you :))

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