[r-t] 3-cycle leadheads

[Philip Earis]

Marky:
> For example the following (treble-dominated Royal) course includes three
> leadheads from the Plain Bob course, but is otherwise different:
>
> 234567890 *
> 089234567
> 756089234
> 423756089 *
> 908423756
> 675908423
> 342675908 *
> 890342675
> 567890342
> 234567890

Umm, I think I'm missing something - which 3 leadheads appear are plain
bob type (ie "regular")? Or else what do you mean by "leadheads from the
Plain Bob course"?