There are many down-sets in the collection of subsets.

The graph is defined by its edge sets.

I bought several gift sets for my friends.

I have several home-sets in my collection.

The store offers a variety of item sets for sale.

The level sets of the function form a closed curve.

The lower sets of the building are used for storage.

Perfect sets are closed sets with no isolated points.

The tailor has a collection of seam sets.

I have many set lists for different concerts.