[r-t] Parity

[Simon Humphrey]

> Leigh Simpson wrote:
> 
> > I was hoping to find a quick way to find the parity . . .

Probably not what you wanted, but:

Write down the row you're interested in.
A little way below it write rounds, on the same number of bells.
Draw a straight line connecting the 1 in each row.
Do the same for each of the other bells in turn. 
The parity of the number of line intersections (i.e. odd or even) is the
parity of the row.

SH