[r-t] Extension

[Robin Woolley]

Quick reply to Alan.

It has been shown that the extension of LS6 -> LS8 has no PB lead-ends 
at least as far as 60! There are four extensions in toto from 6->8 with 
PB lead ends all with this 'quality' - if that's the right word.

5-5.6.5.2.5.36.4-4.3.6-6.5,2

5-5.4.5.2.5.36.4-4.5.6-6.5,2

3-3.4-2-3.4-4.5.6-6.5,2

3-3.4-2-36.4-4.3.6-6.3,2 (8)

R.
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