Let x0 of type ο be given.
Assume H0:
not x0 ⟶ x0.
Apply unknownprop_b257b354d80b58d9a8444b167a21f47b4aabc910dc3698404491d5ef01e18cf3 with
x0,
x0 leaving 2 subgoals.
Assume H1: x0.
The subproof is completed by applying H1.
The subproof is completed by applying H0.