Proofgold Proof

pf
Let x0 of type ι be given. Let x1 of type ι → ι → ο be given. Let x2 of type ι → ο be given. Assume H0: ∀ x3 . ∀ x4 : ι → ι → ο . x2 (pack_r x3 x4). The subproof is completed by applying H0 with x0, x1. ■