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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: x2x1.
Apply UnionI with UPair x0 x1, x2, x1 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying UPairI2 with x0, x1.