[r-t] applicability and timing (was The null change)

[Graham John]

Tim wrote:

> A method at stage N is a process for generating a sequence
> of changes at that stage, which are memorized by ringers
> for the purpose of generating permutations of N bells
> where each bell rings once and only once.

It is the process that is memorised, not the sequence of changes (although that is one way of learning the process), so should it read: 

A method at stage N is a process for generating a sequence of changes at that stage. It is memorized by ringers for the purpose of generating permutations of N bells where each bell rings once and only once.

Graham