Missing part 9 in GitHub

[halfer]

The tutorial chapters run thus (from here):

Introduction
Down the rabbit hole - Part 1
Calling all operators - Part 2
Looping the loop - Part 3
The food factor - Part 4
Rank and file - Part 5
Functionally yours - Part 6
The bear necessities - Part 7
Relational Databases - Part 8
Sessions in cookie jars - Part 10
Sinfully simple - Part 11
Bugging out - Part 12
The trashman cometh - Part 13
A real challenge - Part 14

Would you fix? Thanks.

[ss23]

May I ask you to fix it, if you can?

[halfer]

What, write a missing chapter? :-)

I've my own free tutorial material to work on, so sadly I don't have time. Good work though!