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[ ] [ ( ) ] e¯α0 = 1− 1r2˙a0(u) + 𝒪 (r3) eα0 + r 1− abΩb aa(u) + 1r2a˙a (u ) + 1r2Ra0b0(u)Ωb + 𝒪 (r3) eαa. 2 2 2 (224 )