Let x0 of type ι be given.
Let x1 of type ι → ι → ι be given.
Let x2 of type ι → ι → ι be given.
Apply unknownprop_e98c547c5a316a8ab7ff861e41360de42078adca643acdbb5c67f47e298ac77d with
b6bd3.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.