Proofgold Proof

pf
Let x0 of type ι be given. Let x1 of type ι → ο be given. Let x2 of type ι be given. Let x3 of type ι → ο be given. Assume H0: 0dfb2.. x0 x1 x2 x3. Apply H0 with prim1 x2 x0. Assume H1: prim1 x2 x0. Assume H2: 40dde.. x0 x1 x2 x3. The subproof is completed by applying H1. ■