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[ 1 1 ] e¯αa = δba +--r2ab(u)aa(u) − -r2Rba0c(u)Ωc + 𝒪 (r3) eαb [ 2 2 ] ( b) 1 2 1 2 b 3 α + r 1 − rabΩ aa (u ) + -r ˙aa(u) + -r Ra0b0(u)Ω + 𝒪(r ) e0. (225 ) 2 2