[r-t] Bobs only Erin Triples (was: Composition search)

[Alexander Holroyd]

On Tue, 1 Dec 2015, Richard Smith wrote:

> My code looks for a single round block of 84 sixes (for the 10-part), and if 
> PABS' 10-part works with two or more round blocks covering the 10-part extent 
> then it won't have turned up in my search.  My initial thought had been that 
> this was a harmless omission: that it would result in me missing certain sets 
> of blocks that could only be joined by singles, but not anything that could 
> be joined with bobs because, I had thought, if it were possible to join with 
> bobs, the joined version would also turn up in my search.  But I think I'm 
> wrong; or at least, not sure I'm right.

I'm pretty certain that assmption is wrong.