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Is there a way to export Oracle's UNDO?

I tried exp utility to dump all database. Looks like this exports only the last version of data skipping undo log. Using flashback queries I see: 01466. 00000 - "unable to read data - table ...
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how to use different types of flashback

I'm very new to Flashback technology, I found on this website that, there are 3 types of flashback Row Level Table Level Database Level But, I don't know, how to enable them and use them. Please ...