G'morning David,

 DW> So I made that change, and did a few other little fiddles. I think
 DW> you'll find that this version runs to completion in 3 seconds, or
 DW> possibly even 2!

Interesting !  It still took 4 seconds here, but I saw much more 
of the early solutions that I did in the earlier runs - which 
suggests its slowed up in the initial solving, and speeded up in 
the later stages...

Make any sence ?

:-)
 
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