(a^2 + ab + b^2)(c^2 + cd + d^2) - ( (ac-bd)^2 + (ac-bd)(ad+bc+bd) + (ad+bc+bd)^2 )(a^2 + ab + b^2)(c^2 + cd + d^2) - ( (ac-bd)^2 + (ac-bd)(ad+bc+bd) + (ad+bc+bd)^2 )

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