if I have multiple SWF's that load into another SWF, which we will call "loader.swf", is it necessary to import the libraries that I need within each of the LOADED SWF's, or can I just import the libraries that I need within the "loader.swf" and omit them from all the rest?

I know that assets get loaded based on the path of the "loader.swf", so do libraries work similarly? For example, if I have:

Code:
//loader.swf
import flash.events.Event;

// some code to load my other SWF's
AND

Code:
//SWF that gets loaded into "loader.swf"
//notice I import no libraries

some_mc.addEventListener(Event.COMPLETE, someHandler);
is that sufficient, or do I need to include the libraries in each separate SWF?
thx!