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Issue description

Error 1:

Chapter 3 lab solution part.

There is a section in the playbook where you set variables.

There is a difference in the notation of the variables for the same item
between p.130, when only the variable setting part is shown, and p.133,
when the entire playbook is shown.

Both are grammatically acceptable, but it can be confusing for students.

Error 2:

Chapter 5, First exercise

On p.196, it says to copy the files/users.txt file to each host, but that
file is not created when you install the lab script.

And if it is a new file that needs to be created, it should tell me what it
contains, but it doesn't, and there is no guide to create it.

Steps to reproduce:

Workaround:

Expected result: