Have you got shared matches with the other second cousin and the third cousin, AN? If so, you might be able to work out which lines of their trees are involved.
I've downloaded a free Google Chrome extension called "AncestryDNAhelper" which is currently trawling through all my DNA matches and putting them into some kind of database on my computer, and hopefully when it is finished I will be able to report back on whether it helps. I know there are also some similar (but presumably better) services that charge for use.
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