I have two A-4s in my bag.

There are four figure 4s in the diagram.

The 0-4-4s are parked in the garage.

The 2-6-4s are powerful steam locomotives.

There are many 2-4-4s in the parking lot.

The 4-4-4s are on sale.

The 2-12-4s are on display at the museum.

The 2-8-4s are powerful locomotives.

The 4-6-4s were popular steam locomotives in the mid-20th century.

The 4-14-4s are on sale.