diff --git a/src/main/java/de/joethei/hs/java2/praktikum/praktikum2/CharCollection.java b/src/main/java/de/joethei/hs/java2/praktikum/praktikum2/CharCollection.java
index dcc4a5f..1e1ad55 100644
--- a/src/main/java/de/joethei/hs/java2/praktikum/praktikum2/CharCollection.java
+++ b/src/main/java/de/joethei/hs/java2/praktikum/praktikum2/CharCollection.java
@@ -28,11 +28,11 @@ public class CharCollection implements Cloneable{
     }
 
     public int count(char c) {
-        int rueckgabe = 0;
+        int result = 0;
         for(char b:list) {
-            if(b == c)rueckgabe ++;
+            if(b == c)result ++;
         }
-        return rueckgabe;
+        return result;
     }
 
     public int different() {
@@ -59,7 +59,7 @@ public class CharCollection implements Cloneable{
     }
     */
     public char top() {
-        if(list.size() == 0) return 0;
+        if(list.isEmpty()) return 0;
         int max = 0;
         char character ='_';
         for(char c : list) {
@@ -72,12 +72,45 @@ public class CharCollection implements Cloneable{
         return character;
     }
 
-    public CharCollection moreThan(int n) {
-        CharCollection result = new CharCollection(list);
-        for (int i = 0; i < result.size(); i++) {
-            if(result.count(result.list.get(i)) < n) result.list.remove(i);
+    public CharCollection moreThan(int m) {
+        ArrayList<Character> list2 = new ArrayList<>();
+        for(char c:this.list){
+            if(this.count(c) > m) {
+                list2.add(c);
+            }
         }
-        return result;
+        StringBuilder s = new StringBuilder();
+        for(char c:list2) s.append(c);
+        return new CharCollection(s.toString());
+    }
+
+    public CharCollection except(CharCollection cc) {
+        ArrayList<Character> list= new ArrayList<>(this.list);
+        boolean removeCharacterOnce = false;
+        for(int i=0; i<list.size(); i++){
+            for(int w=0; w<cc.list.size(); w++) {
+                if(cc.list.get(w)==list.get(i) && !removeCharacterOnce) {
+                    removeCharacterOnce=true;
+                    cc.list.remove(w);
+                    list.remove(i);
+                }
+            }
+            if(removeCharacterOnce) i--;
+            removeCharacterOnce = false;
+        }
+        //System.out.println("list2: "+list2.toString());
+        StringBuilder s = new StringBuilder();
+        for(char c:list) s.append(c);
+        return new CharCollection(s.toString());
+    }
+
+    public boolean isSubset(CharCollection cc) {
+        ArrayList<Character> list2 = new ArrayList<>(this.list);
+        for(char c:cc.list) {
+            if(!list2.contains(c)) return false;
+            else list2.remove(list2.indexOf(c));
+        }
+        return true;
     }
 
     @Override
diff --git a/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Node.java b/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Node.java
new file mode 100644
index 0000000..0ea3487
--- /dev/null
+++ b/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Node.java
@@ -0,0 +1,47 @@
+package de.joethei.hs.java2.vorlesungen.binaryTree;
+
+public class Node<T> {
+
+    private T value;
+    private Node<T> left;
+    private Node<T> right;
+
+    public Node() {
+    }
+
+    public Node(T value) {
+        this.value = value;
+    }
+
+    public Node(T value, Node<T> left, Node<T> right) {
+        this.value = value;
+        this.left = left;
+        this.right = right;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public Node<T> getLeft() {
+        return left;
+    }
+
+    public Node<T> getRight() {
+        return right;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if(obj instanceof Node) {
+            Node node = (Node) obj;
+            return node.value.equals(this.value) && node.left.equals(this.left) && node.right.equals(this.right);
+        }
+        return false;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Tree.java b/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Tree.java
new file mode 100644
index 0000000..380691b
--- /dev/null
+++ b/src/main/java/de/joethei/hs/java2/vorlesungen/binaryTree/Tree.java
@@ -0,0 +1,14 @@
+package de.joethei.hs.java2.vorlesungen.binaryTree;
+
+public class Tree<T> {
+
+    private Node<T> root;
+
+    public Tree(Node<T> root) {
+        this.root = root;
+    }
+
+    public Node<T> getRoot() {
+        return root;
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/de/joethei/hs/java2/tests/CharCollectionTest.java b/src/test/java/de/joethei/hs/java2/tests/CharCollectionTest.java
index 33ec209..d3ccf5b 100644
--- a/src/test/java/de/joethei/hs/java2/tests/CharCollectionTest.java
+++ b/src/test/java/de/joethei/hs/java2/tests/CharCollectionTest.java
@@ -50,15 +50,14 @@ public class CharCollectionTest {
         assertEquals(new CharCollection("llo"), new CharCollection("lol"));
     }
 
-    /*
     @Test
     public void except() {
-        assertEquals(new CharCollection("Hao"), new CharCollection("Hallo").except("l"));
+        assertEquals(new CharCollection("Halo"), new CharCollection("Hallo").except(new CharCollection("l")));
     }
 
     @Test
     public void isSubsect() {
-        assertTrue(new CharCollection("Hallo").isSubset("Hao"));
+        assertTrue(new CharCollection("Hallo").isSubset(new CharCollection("Hao")));
     }
-    */
+
  }
\ No newline at end of file
diff --git a/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java b/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java
index c3ee50d..198b7be 100644
--- a/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java
+++ b/src/test/java/de/joethei/hs/java2/tests/VorlesungsTest.java
@@ -1,6 +1,8 @@
 package de.joethei.hs.java2.tests;
 
 import de.joethei.hs.java2.vorlesungen.Sieb;
+import de.joethei.hs.java2.vorlesungen.binaryTree.Node;
+import de.joethei.hs.java2.vorlesungen.binaryTree.Tree;
 import org.junit.Test;
 
 import java.util.Arrays;
@@ -17,4 +19,14 @@ public class VorlesungsTest {
         Set<Integer> set = new TreeSet<>(Arrays.asList(2, 3, 5, 7, 11, 13, 17, 19));
         assertEquals(set, new Sieb(20).getPrimzahl());
     }
+
+    @Test
+    public void binaryTree() {
+
+
+        Tree<Integer> tree = new Tree<>(new Node<>(45, new Node<>(14), new Node<>(16)));
+        assertEquals(Integer.valueOf(45), tree.getRoot().getValue());
+        assertEquals(Integer.valueOf(14), tree.getRoot().getLeft().getValue());
+        assertEquals(Integer.valueOf(16), tree.getRoot().getRight().getValue());
+    }
 }
\ No newline at end of file