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Proofgold Proof

pf
Let x0 of type ιι be given.
Apply Empty_eq with {x0 x1|x1 ∈ 0}.
Let x1 of type ι be given.
Assume H0: x1{x0 x2|x2 ∈ 0}.
Apply ReplE_impred with 0, x0, x1, False leaving 2 subgoals.
The subproof is completed by applying H0.
Let x2 of type ι be given.
Assume H1: x20.
Assume H2: x1 = x0 x2.
Apply EmptyE with x2.
The subproof is completed by applying H1.