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Equation Icon  𝒟 𝒟 𝒟 Ψ = Ψ = Ψ (t − L (t) − L (t − L (t)) − L (t − L (t) − L (t − L (t)))) k j i ;ijk k [ j k i ] k j k ≃ Ψ,ijk + ˙Ψ,ijk L˙i (Lj + Lk) + ˙LjLk , (52 )