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public List<GameObject> enemyFormations = new List<GameObject>(0);
void Update ()
// If we have no enemies on the screen, get a random prefab from our list and spawn it then ensure it is active
if (GameObject.FindGameObjectsWithTag("Enemy").Length <= 0)
GameObject prefab = enemyFormations[Random.Range(0, enemyFormations.Count)];
GameObject formation = Instantiate(prefab);
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