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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: x2x0.
Apply binunionI1 with {Inj0 x3|x3 ∈ x0}, {Inj1 x3|x3 ∈ x1}, Inj0 x2.
Apply ReplI with x0, Inj0, x2.
The subproof is completed by applying H0.