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From a One-Faced Line or a Two-Faced Line.
Do 1/2 of a Couples Trade.
Ends in a Two-Faced Line.
From a One-Faced Line, as one movement, each couple faces the other couple and veers to the left
to form a R-H Two-Faced Line.
From a Two-Faced Line, couples turn 1/4 (90 degrees) around the center point between the two couples.
Ends in a Two-Faced Line at right-angles to the original line.
See also Partner Hinge, and others?