[r-t] Doubles methods with two hunts and a plain course of 120

[Robert Bennett]

Following on from the recent Minor correspondence,  

There are some interesting doubles methods where there are two hunts, and
they (the hunts) cover all possible relative positions  (5 x 4 =20) in
each lead. If they do this once in each lead the plain course is 60, but
if they do this twice, the plain lead is 120.
 An example of the shorter sort is: 

5.1.3.5.3.5.3.125.3.5.1.5.3.125.3.5.3.5.3.1 (lead head 12453) 

This particular one is special because the two hunts are mirror images of
each other. Of course, methods with two different hunts and a three lead
course are familiar doubles territory. 

 
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