From a static square, or a static square with some couples facing out (e.g., after Heads Pass Thru):
Working As Couples, the designated outside dancers turn 1/4 in place to face promenade direction and
Counter Rotate the designated fraction (or 1/4, if none is specified) around the outside of the square,
while the other dancers step forward into the middle. This is a restricted definition for C-1, using only
the permitted formation of a static square.
In this diagram, dancers #1, 2, 7, & 8 are the ones designated to Rotate.