Let x0 of type ι be given.
Let x1 of type ι → ο be given.
Let x2 of type ι → ο be given.
Apply unknownprop_ee0b4b64aba8e6af97035d72b359ab8e1ae1e5e06024c58477c9410cad648356 with
λ x3 x4 : ι → (ι → ο) → (ι → ο) → ο . (∀ x5 . In x5 x0 ⟶ iff (x1 x5) (x2 x5)) ⟶ x4 x0 x1 x2.
Assume H0:
∀ x3 . In x3 x0 ⟶ iff (x1 x3) (x2 x3).
The subproof is completed by applying H0.