Opposite of unique items

Lists Gurus!
I ran into an interesting situation where I needed to identify what items are repeated, and their indexes. The SetIntersection and SetDifference are already processing unique items and dropping the repeats automatically. Perhaps an opposite of UniqueItems for Repeated Items with their indexes could be useful for List Logics.

Please help me advising how I can achieve this with OOTB Dynamo nodes. Or perhaps Code Blocks.

@Vikram_Subbaiah @solamour @Dimitar_Venkov @Kulkul

Archi-lab.net has a component that will do just that for you.

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@Konrad_K_Sobon i can not the “List.DuplicateItemIndicies” Node in Archi-lab.net , please help me to find out.

Capture

hello

another way

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Thank you!