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_2e0d708c351f59ac1980f0f7dffd3d808b6a44c98b96f3cd206ad6dff3cf7c6d with
5fdf5.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.