Let x0 of type ι → ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_4c7c6a01193a68b8e5840b3e04313713b98b7f4e59d0d80bcd9a29ba93e073e2 with
x1,
x2,
x0.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0 with λ x4 x5 . x3 x5 x4.