Random an Array to push to another Array

i have 2 variable with array type data : -cardInside -tempArray

and a random integer called cardRange.

i need to have a pairs of numbers, so at gameCards i set to 8, and cardRange to 4, at first i do random for 4 array example we have [1,2,1,0] at cardInside, then i copy it to tempArray.

what i want is that [1,2,1,0] is random, and put to cardInside array (as the second loop), so i random the 4 array element from tempArray to pushed to cardInside array.

here's the code :

 var cardInside : Array;
 var gameCards : int;
 var cardRange : int;
 var tempArray : Array;
 var tempRandom : int;
 
 function Start() {
 
     for(var i : int = 0 ;i<gameCards/2;i++){
         cardInside.Push(Random.Range(0,cardRange));
     }
     tempArray = cardInside;
     Debug.Log("First tempArray : "+tempArray);
     for(var o : int = 0 ;o<gameCards/2;o++){
     
         tempRandom = Random.Range(0,gameCards/2-o);
         Debug.Log(tempArray[tempRandom]);
         cardInside.Push(tempArray[tempRandom]);
         Debug.Log("tempArray : "+tempArray);
         Debug.Log("CardInside : "+cardInside);
         
     }
 }

and when i compile, i got that, what i pushed to cardInside is pushed to tempArray, i dont know it's pushed or it's always change and same because tempArray = cardInside code.

im planning to made each card is pairing, so if [1,2,1,0] it will be have randomed 1,2,1,0 to be pushed to cardInside, example [1,2,1,0,0,2,1,1], if the early random is [1,0,0,3] it will like example [1,0,0,3,0,3,0,1] so each 4 early number have the pairs.

but as i said what i got is same example :

 1. early random [1,2,1,0]
 2. then tempArray copy cardInside,then tempArray = [1,2,1,0]
 3. then i random 1,2,1,0 to pushed to cardInside, example i random and get from index 2 from tempArray, then i pushed the value
 4. then it should be :
 value from index = 2
 cardInside = [1,2,1,0,1]
 tempArray = [1,2,1,0]
 
 value from index = 1
 cardInside = [1,2,1,0,1,2]
 tempArray = [1,2,1,0]
 
 5.what actually happend :
 value from index = 2
 cardInside = [1,2,1,0,1]
 tempArray = [1,2,1,0,1]
 
 value from index = 1
 cardInside = [1,2,1,0,1,2]
 tempArray = [1,2,1,0,1,2]

please help me, sorry for my bad english, hope you can understand what i mean, u can try the code too~ thanks