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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Assume H0: nIn x1 x2.
Assume H1: x2 = UPair x0 x1.
Apply H0.
Apply H1 with λ x3 x4 . x1x4.
The subproof is completed by applying UPairI2 with x0, x1.