Let x0 of type ο be given.
Let x1 of type ο be given.
Assume H1: x1.
Apply unknownprop_e284d5f5a7c3a1c03631041619c4ddee06de72330506f5f6d9d6b18df929e48c with
x0.
Assume H2: x0.
Apply notE with
x1 leaving 2 subgoals.
Apply H0.
The subproof is completed by applying H2.
The subproof is completed by applying H1.