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Proofgold Proof

pf
Let x0 of type ο be given.
Let x1 of type ο be given.
Assume H0: and (not x0) (not x1).
Assume H1: or x0 x1.
Apply H0 with False.
Assume H2: not x0.
Assume H3: not x1.
Apply H1 with False leaving 2 subgoals.
Assume H4: x0.
Apply H2.
The subproof is completed by applying H4.
Assume H4: x1.
Apply H3.
The subproof is completed by applying H4.