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`BookProof.TwoParticleSector.symmetricOn_fermionic` (hA : SymmetricOn D₂ A) : SymmetricOn (redDom (fermionicProj Hs) (sectorDom Hs D₂ 2)) (redOp (sectorOp Hs D₂ A 2) (isReducingPro · Prove2Me