ActionScript 3.0 :: Garbage Collector Question

I am creating a bunch of movieclips when I first start the flash movie.I then put them into an array and use functions to add and remove them by selecting a random index in the array.When they are removed are they marked for garbage collection?Or can I just keep creating them.Might be hard to understand so code is below


var mc1:mov1 = new mov1();
var mc2:mov2 = mov2();
var mc3:mov3 = mov3();
var mc4:mov4 = mov4();

var theRandomClip:Number;
var movieClipArray = new Array(mc1,mc2,mc3,mc4)

function getRandom():void{
theRandomClip = Math.floor(Math.random()*movieClipArray.length);
addChild(movieClipArray[theRandomClip]);
}

function remove():void{
removeChild(theRandomClip);
}
//Then I would call them in succesion many times

getRandom();
remove();
getRandom();
remove();

//etc do I need to worry about them getting garbage collected and no
//longer being available?


Hope that makes sense