
[;1m  symmetric_partition(Set1, Set2)[0m

  Returns a triple of sets:

   • [;;4mSet3[0m contains the elements of [;;4mSet1[0m that do not belong to [;;4m[0m
     [;;4mSet2[0m.

   • [;;4mSet4[0m contains the elements of [;;4mSet1[0m that belong to [;;4mSet2[0m.

   • [;;4mSet5[0m contains the elements of [;;4mSet2[0m that do not belong to [;;4m[0m
     [;;4mSet1[0m.
