From applicable Parallel Lines (usually Parallel Waves).
Centers Run as Ends do your part Interlocked Diamond Circulate.
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Alternative definition: As one movement, Switch To A Diamond & Very Centers Slither.
Switch To A Diamond [A2] : From a Wave (or any other Line of 4). Centers Run as Ends do your part Diamond Circulate. Ends in a Diamond.
Switch To An Hourglass [A2] : From Parallel Waves (or applicable Parallel Lines). Centers Run as Ends do your part Hourglass Circulate (Lead Ends 1/2 Circulate as Trailing Ends Veer Inward to end in a Mini-Wave with their opposite). Ends in an Hourglass.
See also Interlocked Diamond FORMATION [C1].