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`BookProof.ChapterFreeFieldBornSignAction.boolFlip_comp` (b₁ b₂ : Fin n → Bool) (x : EuclideanSpace ℝ (Fin n)) : boolFlip b₁ (boolFlip b₂ x) = boolFlip (fun k => xor (b₁ k) (b₂ k)) · Prove2Me