Count unique values in one column based on a duplicate in another column

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Peter Schneider
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Count unique values in one column based on a duplicate in another column
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Thanks to all those great people for their contributions!

(stackoverflow.com/users/1191147/hashim-aziz)Hashim Aziz
(stackoverflow.com/users/262683/costi-ciudatu)Costi Ciudatu
(stackoverflow.com/users/548225/anubhava)anubhava
(stackoverflow.com/users/3387716/fravadona)Fravadona
(stackoverflow.com/users/10785975/daweo)Daweo
(stackoverflow.com/users/7366100/markp-fuso)markp-fuso
A special thanks goes out to the (stackoverflow.com/questions/78894153/count-unique-values-in-one-column-based-on-a-duplicate-in-another-column)Stackexchange community

I wish you all a wonderful day! Stay safe :)
If anything is off, please write me at peter D.O.T schneider A.T ois42.de

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