From parallel waves or two faced lines: Ends do half of a Trade as centers flip into vacated end spots to form twin diamonds. Then all diamond circulate. Centers of each diamond arm turn 3/4 as the ends Circulate once. Waves finish as two faced lines and vice versa.
Ralph Pavlik 1973
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.
