I also noticed the amount of comments in the thread need to be even for a reverse thread.

So it must be like this:

A > B > A > B

not A > B > A > B > A

And this thread is already broken, since I replied twice to a comment of yours, lol

edit: wait ... I am dumb.

A > B > A > B > A

would work but not

A > B > A > B

since you can mirror the above but not the bottom one. Or B has to write what A has written