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Proofgold Proof

pf
Let x0 of type ι be given.
Apply Inj1_eq with x0, λ x1 x2 . 0x2.
Apply binunionI1 with Sing 0, {Inj1 x1|x1 ∈ x0}, 0.
The subproof is completed by applying SingI with 0.