In a Longwise set, the rectangle becomes a parallelogram with Crossing (Across the set) replaced by Crossing Diagonally. This Figure involves only 4 Scottish Country Dancers rather than the 6 in the full Figure: the Dancing couple Finish opposite their Starting Positions. Either First or Second Corners, but not both, are involved; the Corners Finish diagonally opposite their Starting Positions, i.e., they Exchange places.
The diagram shows, as an example, bars 29-32 of Bratach Bàna: first, the Dancing couple, in 2nd Place on Opposite Sides, Cross diagonally By the right, the Lady going Down, the Man going Up, and so Exchange places with her/his Partner's First corner positions; then they Cross up and down on the sides By the left to reach 2nd Place on their Own sides.
In a 4-Couple Square set, the path may still be a rectangle but rotated so that the dancers Cross diagonally both Across The set and on the Sides. 4 dancers are involved and they Finish opposite their Starting Positions.
In a 3-Couple Triangular set, the rectangle becomes a trapezium; 4 dancers are involved and they Finish having Exchanged Places. For example, in bars 25-28 of MacPherson's Jig.
the Couples in 1st and 3rd Places Exchange places.