A1:  

(1-4) Nbr RH balance, pull-by R, pull-by L                                   (5-8) Next nbr RH balance, box the gnat.

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A2:

(1-2) This nbr, pull-by R, next nbr pull-by L                               (3-8) Swing original nbr.

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B1:

(1-4) Revolving door                                                                       (5-8) Partner Swing.

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B2:

(1-4) Pass through across, partner California twirl                    (5-8) Circle L 3⁄4, pass thru up & down.

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The Revolving Door is best thought of as a flutter-wheel but in reverse. The ladies take nearer and with their neighbour and take him across the set, leaving him there. They then continue the RH allemande turn over to the side of the set they started from, to find their partner who they swing. I think by doing it this way rather than as a standard flutter-wheel, it flows much better into the Swing.