From Parallel Lines or other applicable formations.
Centers Trade & Roll as Outsides 1/4 Out, Trade &
Veer Out (Press Out).
Parallel Lines end in Facing Lines.
From Parallel Lines:
From Twin Diamonds:
Although Regroup can be done from any Parallel Lines, it is
almost always called from Back-to-Back Lines. This is
primarily done because of flow considerations for the Outside dancers.
Outside 4 always end directly facing each other on the Outside.
The Outsides should pass Right-shoulders with each other. Other
glossaries may define the Outsides' part as 1/4 Out &
Cross Cast Back [C1]
(hence implying a Left-shoulder pass).