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Proofgold Proof

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