I presume you mean

, not

. And if you must know, I have actually had two

's in the same life. Just like any other item, the effect doesn't double, it stays how it is. The code must look something like this (I am obviously not using any real coding language, let alone ActionScript):
IF level number is NOT [set of levels with no point items]
{ IF player has Antok Ring
....... { spawn two point items }
. ELSE { spawn one point item }
}