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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ιι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Assume H0: x2x0.
Assume H1: x3x1 x2.
Apply UnionI with prim5 x0 x1, x3, x1 x2 leaving 2 subgoals.
The subproof is completed by applying H1.
Apply ReplI with x0, x1, x2.
The subproof is completed by applying H0.