Let x0 of type ι be given.
Let x1 of type (ι → ο) → ο be given.
Let x2 of type ι → ι → ι be given.
Apply unknownprop_0855868ea591620cdaec14f4cabeec462ece2ffd8151a0a7f712d6e05c260b7c with
e0718.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.