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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.
The subproof is completed by applying PNoEq_sym_ with x0, λ x3 . prim1 x3 x1, λ x3 . prim1 x3 x2.