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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.
Let x3 of type ο be given.
Assume H0: x1.
Apply orIL with or (or x0 x1) x2, x3.
Apply or3I2 with x0, x1, x2.
The subproof is completed by applying H0.