An additional two series (with format changes) aired from 1963 to 1964.

There is an additional series of walls and trenches in the west annex.

In later years, there were two additional series of ads starring new couples.

He said Manning was going through an additional series of tests on his elbow.

And most of these cable channels are actively developing additional series.

Over the next fifteen minutes, there were two additional series of shots, in different locations.

From 1987 to 1988, Kenner released two additional series of toys.

Industry executives expect only a handful of additional series to be produced each year.

This was followed a few years later by the Rydberg formula, which described additional series of lines.

The show's original run was from 1992 to 1994, while an additional series was produced in 1998.