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Proofgold Proof

pf
Let x0 of type ι be given.
Apply GroupI with {x1 ∈ setexp x0 x0|bij x0 x0 (λ x2 . ap x1 x2)}, λ x1 x2 . lam x0 (λ x3 . ap x2 (ap x1 x3)).
The subproof is completed by applying explicit_Group_symgroup with x0.