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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: ordinal x0.
Let x1 of type ι be given.
Assume H1: x1SNoS_ x0.
Apply SepE2 with prim4 (SNoElts_ x0), λ x2 . ∃ x3 . and (x3x0) (SNo_ x3 x2), x1.
The subproof is completed by applying H1.