diff --git a/Set.java b/Set.java
index 4dd2434..0412add 100644
--- a/Set.java
+++ b/Set.java
@@ -64,6 +64,7 @@ public class Set<T>
 
     public boolean contains (T val){
         Node<T> current = this.first;
+        
         while(current != null){
             if(current.wert == val) return true;
             current = current.next;
@@ -74,10 +75,13 @@ public class Set<T>
     public void remove(T val){
         if(!this.contains(val))return;
         Node<T> current = this.first;
+        if(this.first.wert == val){
+            this.first = this.first.next;
+        }
         while(current.next.wert != val){
             current = current.next;
         }
-        current.next.next = current.next;
+        current.next = current.next.next;
         this.length--;
     }
     
@@ -111,7 +115,7 @@ public class Set<T>
         }
         current = this.first;
         while (current != null){
-            if (!tmp.contains(current.wert)) tmp.add(current.wert);
+            tmp.add(current.wert);
             current = current.next;
         }
         return tmp;
diff --git a/__SHELL4.java b/__SHELL4.java
deleted file mode 100644
index dd5feac..0000000
--- a/__SHELL4.java
+++ /dev/null
@@ -1,7 +0,0 @@
-
-public class __SHELL4 extends bluej.runtime.Shell {
-public static void run() throws Throwable {
-
-test.testset();
-
-}}
diff --git a/package.bluej b/package.bluej
index 01099bc..4727a78 100644
--- a/package.bluej
+++ b/package.bluej
@@ -11,24 +11,24 @@ dependency3.type=UsesDependency
 dependency4.from=Stack
 dependency4.to=Node
 dependency4.type=UsesDependency
-dependency5.from=test
-dependency5.to=LinkedList
+dependency5.from=Set
+dependency5.to=Node
 dependency5.type=UsesDependency
 dependency6.from=test
-dependency6.to=Node
+dependency6.to=LinkedList
 dependency6.type=UsesDependency
 dependency7.from=test
-dependency7.to=List
+dependency7.to=Node
 dependency7.type=UsesDependency
 dependency8.from=test
-dependency8.to=Set
+dependency8.to=List
 dependency8.type=UsesDependency
-dependency9.from=Set
-dependency9.to=Node
+dependency9.from=test
+dependency9.to=Set
 dependency9.type=UsesDependency
 editor.fx.0.height=919
 editor.fx.0.width=2238
-editor.fx.0.x=80
+editor.fx.0.x=2
 editor.fx.0.y=145
 objectbench.height=100
 objectbench.width=776
@@ -36,7 +36,7 @@ package.divider.horizontal=0.6
 package.divider.vertical=0.8003731343283582
 package.editor.height=422
 package.editor.width=661
-package.editor.x=431
+package.editor.x=303
 package.editor.y=271
 package.frame.height=600
 package.frame.width=800
diff --git a/test.java b/test.java
index b8a2721..265d213 100644
--- a/test.java
+++ b/test.java
@@ -37,8 +37,16 @@ public class test
         for (int i = 0; i<20 ; i++){
             test.add(i);
         }
+        Set<Integer> s = new Set<Integer>();
+        for (int i = 11; i < 16; i++){
+            s.add(i);
+        }
         System.out.println(test);
         test.remove(2);
         System.out.println(test);
+        System.out.println(test.subset(s));
+        System.out.println(test.difference(s));
+        System.out.println(test.union(s));
+        System.out.println(test.intersection(s));
     }
 }