diff --git a/p13/Handler.java b/p13/Handler.java
index 6d6bdc5..3280f05 100644
--- a/p13/Handler.java
+++ b/p13/Handler.java
@@ -5,15 +5,15 @@ class Handler
 {
      public void Collide(GameObject go1,GameObject go2)
      {
-          if(type(o1)==type(Ship) && type(o2)==type(Station))
+          if(type(go1)==type(Ship) && type(go2)==type(Station))
           {
             //logic1
           }
-           if(type(o1)==type(Station) && type(o2)==type(Aestroid))
+           if(type(go1)==type(Station) && type(go2)==type(Aestroid))
           {
             //logic2
           }
-           if(type(o1)==type(Ship) && type(o2)==type(Commet))
+           if(type(go1)==type(Ship) && type(go2)==type(Commet))
           {
             //logic3
           }