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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: SNo x0.
Apply add_SNo_com with x0, 0, λ x1 x2 . x2 = x0 leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying SNo_0.
Apply add_SNo_0L with x0.
The subproof is completed by applying H0.