Highlighting Duplicates in two seperate columns

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Seems a simple enough function (of which many many many people have already asked) so I spent the last 3 hours trying to find and copy a formula to work - to no avail.

Simply trying to have Any value in column "a", which is also found anywhere (not just in the same row adjacently) in column "b" highlighted - or check boxed with a helper column.

Please and thanks

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