Now, what I was gonna do now was go through  this quoick transformation right, you're not gonna be asked t to produce it in an exam or anything like that, but the reason why I'm doing it now is that you will need it for your er, your Q M exam  not er your exam, your project  right, cos there is a similar applicat , it's quite a commonly used tool  you'll find  er, where wherever we have a, erm, an expression with an infinite number of erm possibilities or an in infinite number of arguments.