[r-t] Lead-based methods [was: Poll on consecutive blows in the same position]

[Mark Davies]

Tim Barnes writes,

> It seems to
> me that even though a dixonoid can be written as a one-lead method

No. it can't. If you try and do this, you are likely to get different 
sequences of changes (even up to rotation) depending on which row you 
start from. This is not true of a conventional lead-based method, one 
lead or many: by definition, the sequence of changes is always the same.

MBD