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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: exactly1of3 x0 x1 x2.
Apply exactly1of3_E with x0, x1, x2, x0 ⟶ not x1 leaving 4 subgoals.
The subproof is completed by applying H0.
Assume H1: x0.
Assume H2: not x1.
Assume H3: not x2.
Assume H4: x0.
The subproof is completed by applying H2.
Assume H1: not x0.
Assume H2: x1.
Assume H3: not x2.
Assume H4: x0.
Apply H1 with not x1.
The subproof is completed by applying H4.
Assume H1: not x0.
Assume H2: not x1.
Assume H3: x2.
Assume H4: x0.
Apply H1 with not x1.
The subproof is completed by applying H4.
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