Ends Mirror Turn To A Line ('Turn & Deal' toward Promenade direction) as Centers do a Leads U-Turn Back (by turning toward the Left), Veer Right, and As Couples Extend.
Ends in Parallel Lines.
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Alternative definition (this is the original definition!):
Single Polly Wally [C3A]: From a 1 x 4 Column. Outsides Mirror Single Turn To A Line as Centers Left Roll To A Wave and Extend. Ends in a 2 x 2.
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