I am developing a game in as3 memory?

I wanted to know how to make a memory game in as3 where it first has:

1-every time the game runs the cards are random.
2-Have at least one condition to check if the cards are the same and if they are to disappear.
3- if the cards are not equal return to normal
4-all just with a movieclip that contains in the frames the cards

 import flash.events.MouseEvent;

 //variáveis relativo ao score, pattern and so on
 var pattern = new Array();
 var buttons = new Array();
 buttons.push(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p);
 var position = 0;

//Dizer aos botões que esperam ser clicados pelo rato
a.addEventListener(MouseEvent.CLICK, Clicked);
b.addEventListener(MouseEvent.CLICK, Clicked);
c.addEventListener(MouseEvent.CLICK, Clicked);
d.addEventListener(MouseEvent.CLICK, Clicked);
e.addEventListener(MouseEvent.CLICK, Clicked);
f.addEventListener(MouseEvent.CLICK, Clicked);
g.addEventListener(MouseEvent.CLICK, Clicked);
h.addEventListener(MouseEvent.CLICK, Clicked);
i.addEventListener(MouseEvent.CLICK, Clicked);
j.addEventListener(MouseEvent.CLICK, Clicked);
k.addEventListener(MouseEvent.CLICK, Clicked);
l.addEventListener(MouseEvent.CLICK, Clicked);
m.addEventListener(MouseEvent.CLICK, Clicked);
n.addEventListener(MouseEvent.CLICK, Clicked);
o.addEventListener(MouseEvent.CLICK, Clicked);
p.addEventListener(MouseEvent.CLICK, Clicked);

function Clicked(clickInfo:MouseEvent){
trace("Clique");
switch(clickInfo.target){
case a:
    clickInfo.target.gotoAndStop(2);
break;
case b:
    clickInfo.target.gotoAndStop(3);
}
}

I have this in the first frame of the game

I have a movieclip that matches 4 cards (5 frames ex: 1-with border, 2-5: with symbols)