6 color Matte Passes?

I’m trying to figure out how to do 6 color matte passes.

R, G, B, RG, RB, GB

If you take RG split it up. And invert and subtract it works as long as there is a color behind it. But it then double subtracts when on a black background.

I’m sure there is a little script which can break out 6 colors… or a colorx node. Anybody already done this?

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