[r-t] doubles principle

[Alexander Holroyd]

The best I can manage is the following frankly pathetic extent.  Surely 
someone can do better...

    12345
    -----
    23451
    34512
x- 12354
xs 24135
y  32415
s  14253
    -----

4 part

- = 1 for 3
s = 123 for 3
x = 345 for 1st 1
y = 123 for 2nd 5

On Tue, 11 Jul 2006, Alexander Holroyd wrote:

> Here is this week's challenge, folks: find a decent (or even passable)
> extent of the doubles principle 5.1.3.5.1 (5 changes/lead).  How difficult
> can it be - it's only _doubles_?  Nevertheless I haven't been able to do
> it.