[r-t] Doubles question

[Fred Bone]

On 16 Oct 2006 at 11:27, Colin Parker said:

> On 10/16/06, Martin Bright <martin at boojum.org.uk> wrote:
> > I've received an email asking what bobs and/or singles should be used
> > for Cippenham Bob Doubles (&5.1.125.1.5, lead end 123).  It's irregular
> > with lead head 15423.  Do any Doubles experts out there know what would
> > be conventional?
> 
> Plain Bob Plains

And as with PB, there's essentially only one extent (using only one 
call). Four rotations, of course.

If you use "1" as a single, you can get three more, by calling SPSB 
instead of PPPB once or twice (12 rotations each) or thrice (4 
rotations). Calling SPSB instead of PPPB amounts to ringing the middle 
two leads backwards.