How to get unique value from two arrays?

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UserTwo2020-11-28 00:09:29

Java

UserTwo, 2020-11-28 00:09:29

Let's say there are three list arrays (ArrayList).
The first and second objects each have two fields of type int (id) and string (value). The third one stores a list of already used pairs (the question is in what form, open).

How to create a unique couple?

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