ActionScript 3.0 :: MovieClips - Dynamic Naming Links To Variable

I am doing the following
Code:
Select allvar a:MovieClip = new MovieClip();
addChild(a);
Now what I want to do is I want to create six more mc i.e., a2,a3,a4,a5,a6. I want to accomplish this using loop like this:
Code: Select allvar i:Number = 0;
while(i < 6){
var a:MovieClip = new MovieClip();
addChild(a);
}

So with above method how can I give different names link above to var a? Then I am using all of these var as following:
Code:
Select allvar cube:Cube = new Cube(new MaterialsList({
front:a , left:a2, right:a3, top:a4, bottom:a5, back:a6}),200, 200, 200,10, 10, 10);
scene.addChild(cube);
How can I use those dynamic name here?