Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι → ο be given.
Apply unknownprop_23bdcfa087c4ebd4c1621c6f6eaf3a155d9bf4fc9f656e2361575b6752e3493f with
da24e.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.