help with fruit ninja like slice combo

Hello. I am trying to script a combo where multiple prefabs tossed in the air like fruit ninja are sliced in one swipe. I want that when the swipe gameobject collides with three or more prefabs this creates a combo and then a "combo" prefab is spawned at the position of the last hit prefab saying 3,4, or 5 hit combo based on the number of prefabs hit with one swipe. I have no clue as to how to do this, and everything i tried does not seem to work.

This is what i have tried: in pseudocode - when the collision occurs with the swipe gameobject and the prefab, save the locations of the collisions in a list, then check the number of collisions which occurred in 1 second, which is the timeframe for the combo, and then spawn the correct combo gameobject at the last collision point based on the number of hits within the timeframe.

I tried this code below but could not get it to work. PLEASE HELP??

 var myHitList : List.<Vector3> = new List.<Vector3>();
 var hits : Collider2D[];
 var combo : GameObject;
 var combo1 : GameObject;
 var combo2 : GameObject;
 var combo3 : GameObject;
 var combo4: GameObject;
 var hit : float;
 
 
 function OnCollisionEnter2D(coll: Collision2D) {
     if (coll.gameObject.tag == "slice" && myHitList.Count == 0){
         Invoke ("Do", 1);
         Turn();
         }
     if (coll.gameObject.tag == "slice"){
         myHitList.Add(coll.gameObject.transform.position);
         }
     if(hit == 3)
         {
             Instantiate(combo, myHitList[myHitList.Count-1], Quaternion.identity);
             Instantiate(combo1, myHitList[myHitList.Count-1], Quaternion.identity);
         }    
     else if(hit == 4)
         {
             Instantiate(combo, myHitList[myHitList.Count-1], Quaternion.identity);
             Instantiate(combo2, myHitList[myHitList.Count-1], Quaternion.identity);
         }    
     else if(hit == 5)
         {
             Instantiate(combo, myHitList[myHitList.Count-1], Quaternion.identity);
             Instantiate(combo3, myHitList[myHitList.Count-1], Quaternion.identity);
         }    
     else if(hit == 6)
         {
             Instantiate(combo, myHitList[myHitList.Count-1], Quaternion.identity);
             Instantiate(combo4, myHitList[myHitList.Count-1], Quaternion.identity);
         }                
 }
 
 function Update() { 
 
 }
 
 function Turn (){
 yield WaitForSeconds (1.2);
 myHitList.Clear();
 hit=0;
 CancelInvoke("Do");
 }
 
 function Do (){
 hit = myHitList.Count;
 }