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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.
Let x3 of type ιιι be given.
Let x4 of type ιιι be given.
Assume H0: explicit_CRing_with_id x0 x1 x2 x3 x4.
Apply explicit_Ring_with_id_minus_one_In with x0, x1, x2, x3, x4.
Apply explicit_CRing_with_id_Ring_with_id with x0, x1, x2, x3, x4.
The subproof is completed by applying H0.