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Continue to ChatFirst of all, we don't even know if we could, legally, and quite frankly, just making the 'Arrow'-verse, which is what we call Legends, Flash and Arrow work and then making 'Supergirl' work, it's enough of a challenge without having to add a fourth player. - Andrew Kreisberg from https://whatsmyquote.com/quote/first-of-all-we-don-t-even-know-if-we-could-legally-and-quite-frankly-just-making-the-arrow-verse-which-is