Each number follows some rules about presentation and contains only one work.

A number of the theater complexes will contain office and retail space, the company said.

A number of works contain more than passing references to old masters.

A number of building materials still in use today contain asbestos.

The number and variety contained in each box has varied over the years.

A significant number of questions contained dialogue from the show.

A large number of the strips contain mathematics or computer science jokes.

Without Warning contains a large number of references to popular culture.

It does, in fact, contain a number of observations on these points.

The numbers are either premium rate, or contain advertising messages.