Let x0 of type ι be given.
Let x1 of type (ι → ο) → ο be given.
Let x2 of type ι → ι be given.
Apply unknownprop_f3e9c55b476f54285bbdfa8ab89b23919535add488591b1a7699e49226b365d3 with
fc7e7.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.