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Regardless of maths I still doubt GW would have done this, so again I highly doubt you can still take squads of 12.

Oh and grow up.

By buying two boxes to make 12, which means you'll need to buy another box to add 2 models to the second box, another to add 4 models to the third box and another add infinity to get squads of 12.
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Seeing that the dual box only has 10 men, I doubt they're still up to 12 strong.