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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: nat_p x0.
Apply mul_nat_com with 1, x0, λ x1 x2 . x2 = x0 leaving 3 subgoals.
The subproof is completed by applying nat_1.
The subproof is completed by applying H0.
The subproof is completed by applying mul_nat_1R with x0.