[r-t] Minor principles

[Alexander Holroyd]

> > Unless I'm missing something you would need the 1234 single _every_
> > lead, and then some other calls elsewhere
>
> Really? Can't we have a 1234 single every lead, but replaced with e.g. a
> 1236 bob every now and then to link blocks? Or am I missing something?

Yes I guess there's no reason why not - one could try a search...

> Alternative a 1440 has got to be easy, hasn't it?

I'm not sure why...