choose a trigger RANDOMLY and clone an SPECIFIC prefab

hi.
i need some help on this problem please.
i will apreciatte so much....

I have 3 or more different kind of enemies runing
and they randomly choose their own path.

and I need to instantiate a prefab, OnTriggerEnter
accord which enemy choose which trigger.

for example....
if green enemy choose trigger 1, ... then
Instantiate (prefab_1, ........);

but what if the same green enemy choose trigger 2, ... then
Instantiate (prefab_2, ........);

or if he choose trigger 3, then
Instantiate (prefab_3, ........);

my specific problem is the script structure inside the trigger, or inside on any enemy.
choose a trigger RANDOMLY and clone an SPECIFIC prefab

any idea please ?
really i will apreciatte so much any kind of help with this.....

how goes the script structure....
.

 

Code (CSharp):

1. void OnTriggerEnter(Collider coll){
2.     if(coll.gameObject.tag == "Trigger1"){
3.         Instantiate(prefab1....
4.     }else if(coll.gameObject.tag == "Trigger2){
5.        Instantiate(prefab2...
6.    }
7. }

 

thanks so much ... its working ...
but if the same soldier try to pass again... ( two times ) not work.

thanks againa