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From Parallel Two-Faced Lines or other applicable formations.
Couples move forward one position to take the position of the couple in front of them
along a circulate path.
Parallel Two-Faced Lines end in Parallel Two-Faced Lines.
Diagram 2FL, mentioning that lead couples turn 180 degrees to end in the
far side, and that trailing couples just move forward.
Talk about Facing Lines, and Back-to-Back Lines.