From parallel lines with centers facing one way and ends facing another (NOTE: A very advanced movement): All Split Trade Circulate once and a half (forms twin diamonds with both points facing the same way). Centers of the wave across the set Trade and the points of the diamond do a Partner Trade, remaining close together. Original diamond centers now move up to become ends. Finishes in parallel Three and One lines.
Weldon Hamma 1975
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.