im having problems spawning these prefabs in a grid next to each other with some spacing thanks in advance

using UnityEngine; using System.Collections;

public class ArraysScript : MonoBehaviour {

 int[] arrayOfNums = new int[36];

 GameObject[] arrayOfSprites;

 bool exists = false;

 int count = 0;

 float x;
 float y;
 public float spacing = 2f;



 void SpawnRandomSprite()
 {
     //random location
     int location = Random.Range(0, arrayOfSprites.Length);

     Debug.Log(location);

     exists = false;

     for (int i = 0; i < arrayOfNums.Length; i++)
     {
         //if position is empty
         if (arrayOfNums[i] == -1)
         {
             //if the number does not exist in arrayOfNums
             if (exists == false)
             {
                 arrayOfNums[i] = location;
                 exists = false;
                 break;
             }
         }
         else if (arrayOfNums[i] == location)
         {
             exists = true;
         }

     }
     //if object does not exist in array
     if (exists == false)
     {

         Vector3 pos = new Vector3(x, 0, y) * spacing;
         //spawns a random object from the array in the random position randomXY
         GameObject spawn = Instantiate(arrayOfSprites[location], pos, transform.rotation) as GameObject;
         count++;
     }
      



 }


 // Use this for initialization
 void Start()
 {
     x = transform.position.x;
     y = transform.position.y;

     //loads all GameObjects found in Assets/Resources/prefabs
     arrayOfSprites = Resources.LoadAll<GameObject>("prefabs");
     //show all objects in console
     foreach (GameObject temp in arrayOfSprites)
     {
         Debug.Log(temp.name);
     }

     //fill arrayOfNums with -1
     for (int a = 0; a < arrayOfNums.Length; a++)
     {
         arrayOfNums[a] = -1;
     }
 }

 // Update is called once per frame
 void Update()
 {

     if (count < 36)
     {
         SpawnRandomSprite();
     }


 }

}