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_ee7eaf42c9cab664fce0b212cffc5a07506bc61fd306654137cb5c19d670ad8d with
5fdf5.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.