[r-t] Doubles

Philip Saddleton pabs at cantab.net
Fri Oct 22 18:30:47 UTC 2004

Alexander Holroyd <holroyd at math.ubc.ca> wrote at 16:06:24 on Thu, 21 Oct 
>It has been a bit quiet recently.  Come on, someone give us an amusing 
>problem to work on....

Can someone provide sets of 42 extents of spliced Doubles (symmetrical 
single-hunt Plain) with the following properties?

a) The 177 methods with 3- or 4-lead courses (excluding 145 lead ends), 
with a plain lead of each method.

b) The 220 methods if 145 lead ends are included, all plain leads.

c) The 282 methods with Differential Hunters included, again all plain 


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