Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι → ι be given.
Apply unknownprop_ed77cf25ece78328b4b87e0803ace16b9465073f34be651552f251cf47f6b2b6 with
5fdf5.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.