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Equation Icon  α1 = [𝒟3𝒟1 𝒟2 − I][η1′ + 𝒟2′η3′ + 𝒟1 ′𝒟2 ′η2′] − [𝒟2 ′𝒟1 ′𝒟3 ′ − I][η1 + 𝒟3 η2 + 𝒟1 𝒟3 η2]. (63 )