Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_9cbe1b438cb309fdaf3dcacebb3b572a10a17828098a582be8e9441d5a1eab25 with
λ x3 x4 : ι → ι → ι . In x2 (x4 x1 x0) ⟶ In x2 (Pi x0 (λ x5 . x1)).
Assume H0:
In x2 (Pi x0 (λ x3 . x1)).
The subproof is completed by applying H0.