Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply set_ext with
SetAdjoin (UPair x0 x1) x2,
SetAdjoin (UPair x0 x2) x1 leaving 2 subgoals.
The subproof is completed by applying unknownprop_ea6ffaa54d1e073cccc9fdc592d44a1b4d212a3ece05c250c453cc907e922554 with x0, x1, x2.
The subproof is completed by applying unknownprop_ea6ffaa54d1e073cccc9fdc592d44a1b4d212a3ece05c250c453cc907e922554 with x0, x2, x1.