Mark identical elements in repeating group

Hi i have a Thing “anfragen” which contains a column “Gesamttagedaten” which contains a List of dates. This thing is displayed in a repeating group. Now i want to mark identical dates in the repeating Table.

i managed to get identical elements from line one a two of the repeating List but I need to compare all Dates of the columns with all dates in one line.

“Compare current cell Anfrage’sGesamttagedaten with cell+1 Anfrage’sDaten” is what I want to achieve…

this i want in the end:

this i got so far:

and my database structure

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