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Proofgold Proof

pf
Let x0 of type ο be given.
Let x1 of type ο be given.
Let x2 of type ο be given.
Assume H0: x0x2.
Assume H1: x1x2.
Assume H2: or x0 x1.
Apply H2 with x2 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.