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Proofgold Proof

pf
Let x0 of type ιι be given.
Let x1 of type ιι be given.
Assume H0: not (x0 = x1).
Assume H1: f8922.. (λ x2 : ι → ι . or (x2 = x0) (x2 = x1)).
Let x2 of type ι be given.
Assume H2: 9a7b4.. x0 x1 x2.
Let x3 of type ο be given.
Assume H3: x3.
The subproof is completed by applying H3.