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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ιι be given.
Let x2 of type ιι be given.
Assume H0: ∀ x3 . x3x0x1 x3x2 x3.
Apply Sigma_mon with x0, x0, x1, x2 leaving 2 subgoals.
The subproof is completed by applying Subq_ref with x0.
The subproof is completed by applying H0.