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Technically, Einstein-Dilaton-Gauss–Bonnet gravity has a very particular set of coupling functions f (𝜗) = f (𝜗) = f(𝜗) ∝ eγ𝜗 1 2 3, where γ is a constant. However, in most cases one can expand about γ𝜗 ≪ 1, so that the functions become linear in the scalar field.