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Proofgold Proof

pf
Let x0 of type ο be given.
Let x1 of type ο be given.
Assume H0: x0.
Assume H1: not x1.
Apply orIL with and x0 (not x1), and (not x0) x1.
Apply andI with x0, not x1 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.