G'morning David, 

 DW> I keep trying to streamline this thing further, and I do sometimes
 DW> manage to shave just a little bit off the execution time. Here's the
 DW> latest, and fastest, version. Can anyone do better?

Mmmm - this one runs here between 0 - 10000 in 4 seconds - 
probably because of the shift from integers.  It's getting to be 
an impressive case-study, nevertheless, and is safely filed away 
against some future use....

:-))
 
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