gistfile1.txt

using UnityEngine;
using System.Collections;

public class Generation : MonoBehaviour {

	public GameObject Prefab1;
	public GameObject Prefab2;
	public GameObject Prefab3;
	public GameObject Prefab4;
	public GameObject Prefab5;
	public float Timer = 1;
	public float Xposition = 0;
	public float Yposition = 6;
	public float areaA = 0.0f;
	public float areaB = 4.0f;

	// Use this for initialization
	void Start () {
		StartCoroutine(Loop(Timer));
	}
	
	// Update is called once per frame
	void Update () {
	
	}

	// Update is called once per frame
	private IEnumerator Loop (float time) {
		while (true){
			yield return new WaitForSeconds(Timer);
			float area = Random.Range(areaA,areaB);
			int seisuu = Random.Range(0,5);
			var array = new []{Prefab1,Prefab2,Prefab3,Prefab4,Prefab5};

			Instantiate(array[seisuu],new Vector2(area,Yposition),Quaternion.identity);
		}
	}

}