[r-t] Backstroke 65s

Tue Apr 4 16:49:00 UTC 2017

In an extent of PB Minor using only standard calls, what is the maximum
number of 65s at backstroke it is possible to get? Obviously 214365 has to
come at hand. As does one of 124365, 132465 or 123465 before it comes
round. But is it possible to get all the other 22 changes at backstroke?

Sorry if anyone is disgusted by this question :-)

Thanks,
Joe.
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