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_c24555a27d07e542998a74cc997c88369f7e6344e3095ead3ad4250739b311d2 with
e0718.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.