Why does my array only execute the last of the array?

How come my code only creates 1 plane based on the last values of the array, instead of the amount of the length of the array?

 using UnityEngine;
 using System.Collections;
 
 public class LevelSystem : MonoBehaviour {
 
     public Vector2[] coordX;
     public Vector2[] coordY;
     private float l = 100f;
 
     // Use this for initialization
     void Start () {
     
         for (int i = 0; i < coordX.Length; i++) {
             MeshFilter mf = GetComponent<MeshFilter>();
             Mesh level = new Mesh();
             mf.mesh = level;
             
             
             //verts
             Vector3[] verts = new Vector3[]{
                 new Vector3 (coordX[i].x, coordX[i].y, 0f), 
                 new Vector3 (coordY[i].x, coordY[i].y, 0f),
                 new Vector3 (coordX[i].x, coordX[i].y, l),
                 new Vector3 (coordY[i].x, coordY[i].y, l)
             };
 
             //Tris
 
             int[] Tri = new int[6];
             Tri[0] = 0;
             Tri[1] = 2;
             Tri[2] = 1;
             
             Tri[3] = 1;
             Tri[4] = 2;
             Tri[5] = 3;
 
             //Normals
             Vector3[] normals = new Vector3[4];
             
             normals[0] = Vector3.forward;
             normals[1] = Vector3.forward;
             normals[2] = Vector3.forward;
             normals[3] = Vector3.forward;
             
             //UVs
             Vector2[] uv = new Vector2[4];
             uv[0] = new Vector2(0,0);
             uv[0] = new Vector2(1,0);
             uv[0] = new Vector2(0,1);
             uv[0] = new Vector2(1,1);
             
             //assign
             level.vertices = verts;
             level.triangles = Tri;
             level.normals = normals;
             level.uv = uv;    
 
             //foreach (var item in normals) {
             //    Debug.Log(item);
             //}
         }
     }
 }