Ron, what a great question.  I think it's interesting that Ted  
Sannella once said that a dance had to have 50% different  
choreography in order to be a new dance.   Although I never asked him  
why, it occurred to me that there might be a historical reason for  
his view.
Take Petronella, Hull's Victory and others.  They have unigue A parts  
but the same B: ones down the center, return, cast, rights and lefts....
Chorus Jig and Rory O'More fit the same pattern, different A but  
share the same B.
Even squares can fit the same pattern.  Look at how many squares have  
as their B part, circle left half, swing corner, promenade.
T
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