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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Apply set_ext with binunion x0 x1, binunion x1 x0 leaving 2 subgoals.
The subproof is completed by applying binunion_com_Subq with x0, x1.
The subproof is completed by applying binunion_com_Subq with x1, x0.