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ψ03 = ψ04 = 0, (253 ) ∂ ψ0 = 0, (254 ) 2 ∂ ψ01 = 3σ0ψ02, (255 ) 0 2- -0 -2 -- Ψ ≡ ψ 2 + ∂ σ = ψ2 + ∂ σ = Ψ. (256 )