Their format varies, with some just big enough to cover a face.

The format has hardly varied for three decades, even its details.

As such, the format expected by different players varies.

The format of the series has varied over the years.

This remained the case for the first three seasons, though the format has varied slightly in each season.

In recent years, its format has varied from newspaper to a glossy magazine.

Members and friends may meet in small groups, the format of which varies.

Its format varied during the early part of its history.

It is when the meal and the dishes are done that the format varies.

The format of each volume has varied over the years.