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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ιο be given.
Let x2 of type ι be given.
Assume H0: In x2 (Sep x0 x1).
Apply unknownprop_6a6b356f855b99f3fbff4effcb62e3ee6aa23839e10650eb28a503a368c2bb09 with x0, x1, x2, In x2 x0 leaving 2 subgoals.
The subproof is completed by applying H0.
Assume H1: In x2 x0.
Assume H2: x1 x2.
The subproof is completed by applying H1.