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  • Henri Fourie thinks this is interesting:

For example, the set {a, b, c} is considered equal to the set {a, a, b, c, c, c}.

From

Cover of Exam Ref 70-761 Querying Data with Transact-SQL, First Edition

Note

Here is a mistake - Set is not exampled correctly do not get confused, the second set should be : {a, a, b, b, c, c}.