Forum Store CSS as Files Difference between L and R
 

I am just wondering, and hopefully one of the dev's can explain the difference between the folders ending in "l" and those ending in "r" when storing CSS as files? I notice when I look at page sources, and do site speed/optimization tests that always the folder ending in "l" is used for each style.

There are 2 folders for each style in the clientscript/vbulletin_css folder, which seem to be formatted with the word style, followed by 5 numerical digits, starting with 0 for the style ID on the site (00101 for style ID 101) followed by the letter l or r. (example style00101l and style00101r for the style on my site with ID 101)

One would assume this means left and right, however only left seems to be used. Is r a backup maybe?

Nothing is broken on my site, I am just curious.

Thanks!