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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Assume H0: ordinal x1.
Assume H1: ordinal x2.
Assume H2: SNo_ x1 x0.
Assume H3: SNo_ x2 x0.
Apply set_ext with x1, x2 leaving 2 subgoals.
Apply SNoLev_uniq_Subq with x0, x1, x2 leaving 4 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.
The subproof is completed by applying H3.
Apply SNoLev_uniq_Subq with x0, x2, x1 leaving 4 subgoals.
The subproof is completed by applying H1.
The subproof is completed by applying H0.
The subproof is completed by applying H3.
The subproof is completed by applying H2.
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