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Switched Mitchells

I would like to run a 20 table single winner movement.  I came across Duplicate Bridge Schedules, History and Mathematics by Ian McKinnon.  For 20 tables he lists rounds 1, 3, 11 should be a switch round.  He also has some numbers in parenthesis beside those numbers in this case (10, 12, 20).  What do those numbers refer to?


Many thanks

Grant W. Bell

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