On Wed, Oct 03, 2007 at 11:41:33AM +0200,
Iñaki Martínez Díez wrote
a message of 23 lines which said:

> > How many records?
> >

> How can i calculate that ?
>
> Each zone is very diferent and there are too many zones.


There is a very interesting (but difficult) mathematical concept that
may help here:

http://en.wikipedia.org/wiki/Addition