Thanks, @Kurt_Bremser. I think this credit goes to you, as @urap considered as accepted solution. @urap , is it possible for you to take that off, please?
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@urap
First step before writing any code:
1. Define the problem(s) to be solved (=requirement)
2. Analyze the data you've got (have)
3. Define the result you need (want)
4. Define the logic you need to implement to get from your "have" to your "want" (gap)
....and now you're at the point where you can start to think about how to solve this technically and if you don't know "how to" are in a position to ask targeted questions in this forum.
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