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Equation Icon  q + q′− 𝒟 q′− 𝒟 q = 0, 1 1 3 2 2 3 q2 + q′2 − 𝒟1q ′3 − 𝒟3q1 = 0, (26 ) q + q′− 𝒟 q′− 𝒟 q = 0. 3 3 2 1 1 2