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Creating unique list from diffrent list

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Hello Members,

I want to keep the unique list from the list of two list. I could so it from Set, but my problem is that I have to prepare a list myself. The following example will make it more clearer.
There are three list

I am populating both list in this way

This is my DTO

After doing this I am able to get two lists, one has unique elements while another has duplicated one. I want to create a list with unique ICDname but having all the disgnoseString with the same ICDname. It is a kind of Search in SQL as

I spent around 3 days but couldn't solve it !

I also tried this logic but failed !

Thanks in advance !
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