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Equation Icon  ∫ { √ --- 2 ab abcd S ≡ − g κR + α1f1 (𝜃)R + α2f2(𝜃)RabR + α3f3(𝜃)RabcdR } ∗ abcd β- a + α4f4(𝜃)R abcdR − 2 [∇a 𝜃∇ 𝜃 + 2V (𝜃)] + ℒmatter , (19 )