User blog comment:SpiritedDreaming/RWBY: Attack on Kevin Tower Defense Game/@comment-25936766-20160920122749/@comment-25936766-20160920143912

...Oh, you mean the "-th"? I had it understood that the "-th" was applied to numbers above 3. 1st, 2nd, 3rd, and then 4th, 5th, 6th, and so on.

So it repeats at the start of every sequence after reaching 20? 21st, 22nd, 23rd then 24th, 25th, 26th?