Let x0 of type ι be given.
Let x1 of type ι be given.
Apply unknownprop_91ac230cee6f6b845375b6f43e0a69c207c52d0119237822cf5bfa0b164f17fd with
x0,
x0,
x1,
prim1 x0 (prim2 x0 x1).
Apply H1.
Apply orIL with
x0 = x0,
x0 = x1.
Let x2 of type ι → ι → ο be given.
Assume H2: x2 x0 x0.
The subproof is completed by applying H2.