ACEY DEUCEY

Starting formation: parallel waves and two-faced lines. Other formations which meet the following conditions are also acceptable: Must be able to identify 4 centers and 4 ends (or outsides).
Centers must be able to trade within in adjacent pairs of 2. Ends (or outsides) must be able to Circulate and not become centers. Center 4 Trade, while the others Circulate.

Timing: 4