Create a set representing a real-life group of "things" and write it in roster notation. The members of the set...

Create a set representing a real-life group of "things" and write it in roster notation. The members of the set can be groups such as tools you will use in your future profession, breeds of dogs, or your siblings or children. It is even ok to use letters, numbers, and/or symbols. The choice is yours, and humor and creativity are encouraged.