Duplex and terminator

[CookieBoble]

such a question. I have a terminator that shoots 3 arrows per shot. If I enchant it with duplex. Will it shoot 6 arrows per shot or 4 arrows per shot. 3 of which are main and 1-3 additional?
I would like to apologize right away for such a stupid question... But I am really interested. And it is expensive to check.

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