1-8: 1st couple spin for 16 beats.

 

9-16 1st couple work down the opposite line (ie of the people of the opposite sex) turning side person LH, partner RH, next side person LH, ...

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17-24: 2nd couple spin for 16 beats.

 

25-... 2nd couple work their way down the lines as 1st couple... When 1st couple reach the bottom, they spin to the end of the phrase, then join the side lines. A new couple starts every 16 bars.