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`BookProof.TwoParticleSector.sectorOp_swapH` (x : sectorDom Hs D₂ 2) : sectorOp Hs D₂ A 2 ⟨swapH Hs (x : (Hs.pow 2).carrier), swapH_mem_sectorDom Hs D₂ x.2⟩ = swapH Hs (sectorOp Hs · Prove2Me