diff --git a/com/xgiovio/ListPartitionTest.java b/com/xgiovio/ListPartitionTest.java
new file mode 100644
index 0000000..23201bd
--- /dev/null
+++ b/com/xgiovio/ListPartitionTest.java
@@ -0,0 +1,48 @@
+package com.xgiovio;
+
+import partition.ListPartition;
+import position.NodePositionList;
+import set.OrderedListSet;
+import set.Set;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 18/05/2014
+ * Time: 15:58
+ */
+public class ListPartitionTest {
+
+    public static void main(String[] args) {
+
+        ListPartition<String > a = new ListPartition<String>() ;
+
+
+        Set<String> a1 =  a.makeSet("1");
+        System.out.println(a);
+        Set<String> a2 = a.makeSet("2");
+        System.out.println(a);
+        Set<String> a3 = a.makeSet("3");
+        System.out.println(a);
+        Set<String> a4 = a.makeSet("4");
+        System.out.println(a);
+
+        Set<String> out;
+        out = a.union(a1,a2);
+        System.out.println(a);
+        out = a.union(out,a3);
+        System.out.println(a);
+        out = a.union(out,a4);
+        System.out.println(a);
+
+
+
+
+
+
+
+
+
+
+    }
+}
diff --git a/graph/AdjacencyListGraph.java b/graph/AdjacencyListGraph.java
index 895a1d1..30f6543 100644
--- a/graph/AdjacencyListGraph.java
+++ b/graph/AdjacencyListGraph.java
@@ -15,25 +15,29 @@ import java.util.Iterator;
  * @author Roberto Tamassia, Eric Zamore
  */
 
+  /*
 public class AdjacencyListGraph<V,E> implements Graph<V,E> {
 
     protected NodePositionList<Vertex<V>> VList;	// container for vertices
     protected NodePositionList<Edge<E>> EList;	// container for edges
-    /** Default constructor that creates an empty graph */
+
+    // Default constructor that creates an empty graph
     public AdjacencyListGraph() {
         VList = new NodePositionList<Vertex<V>>();
         EList = new NodePositionList<Edge<E>>();
     }
-    /** Return an iterator over the vertices of the graph */
+
+    // Return an iterator over the vertices of the graph
     public Iterable<Vertex<V>> vertices() {
         return VList;
     }
-    /** Return an iterator over the edges of the graph */
+
+    // Return an iterator over the edges of the graph
     public Iterable<Edge<E>> edges() {
         return EList;
     }
-    /** Replace the element a given position (vertex or edge) with a new
-     element and return the old element */
+
+    // Replace the element a given position (vertex or edge) with a new element and return the old element
     public Object replace(Position p, Object o)
             throws InvalidPositionException {
         MyPosition pp = checkPosition(p);
@@ -41,20 +45,23 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         pp.setElement(o);
         return temp;
     }
-    /** Return an iterator over the edges incident on a vertex */
+
+    // Return an iterator over the edges incident on a vertex
     public Iterable<Edge<E>> incidentEdges(Vertex<V> v)
             throws InvalidPositionException {
         MyVertex<V> vv = checkVertex(v);
         return vv.incidentEdges();
 
     }
-    /** Return the endvertices of a edge in an array of length 2 */
+
+    // Return the endvertices of a edge in an array of length 2
     public Vertex<V>[] endVertices(Edge<E> e)
             throws InvalidPositionException {
         MyEdge<E> ee = checkEdge(e);
         return ee.endVertices();
     }
-    /** Return the other endvertex of an incident edge */
+
+    // Return the other endvertex of an incident edge
     public Vertex<V> opposite(Vertex<V> v, Edge<E> e)
             throws InvalidPositionException {
         checkVertex(v);
@@ -67,7 +74,8 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         else
             throw new InvalidPositionException("No such vertex exists");
     }
-    /** Test whether two vertices are adjacent */
+
+    // Test whether two vertices are adjacent
     public boolean areAdjacent(Vertex<V> u, Vertex<V> v)
             throws InvalidPositionException {
         // search the incidence list of the vertex with smaller degree
@@ -86,7 +94,8 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         }
         return false;
     }
-    /** Insert and return a new vertex with a given element */
+
+    // Insert and return a new vertex with a given element
     public Vertex<V> insertVertex(V o) {
         MyVertex<V> vv =  new MyVertex<V>(o);
         VList.addLast(vv);
@@ -94,8 +103,8 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         vv.setLocation(p);
         return vv;
     }
-    /** Insert and return a new edge with a given element between two
-     vertices */
+
+    // Insert and return a new edge with a given element between two  vertices
     public Edge<E> insertEdge(Vertex<V> v, Vertex<V> w, E o)
             throws InvalidPositionException {
         MyVertex<V> vv = checkVertex(v);
@@ -109,8 +118,8 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         ee.setLocation(pe);
         return ee;
     }
-    /** Remove a vertex and all its incident edges and return the
-     element stored at the removed vertex */
+
+    // Remove a vertex and all its incident edges and return the element stored at the removed vertex
     public V removeVertex(Vertex<V> v)
             throws InvalidPositionException {
         MyVertex<V> vv = checkVertex(v);
@@ -123,7 +132,8 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         VList.remove(vv.location());
         return v.element();
     }
-    /** Remove an edge and return its element */
+
+    // Remove an edge and return its element
     public E removeEdge(Edge<E> e)
             throws InvalidPositionException {
         MyEdge<E> ee = checkEdge(e);
@@ -138,13 +148,13 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
 
     // Auxiliary methods
 
-    /** Return the degree of a given vertex */
+    // Return the degree of a given vertex
     public int degree(Vertex<V> v) {
         MyVertex<V> vv = checkVertex(v);
         return vv.degree();
     }
 
-    /** Determines whether a given position is valid. */
+    // Determines whether a given position is valid.
     protected MyPosition checkPosition(Position p)
             throws InvalidPositionException {
         if (p == null || !(p instanceof MyPosition))
@@ -152,7 +162,7 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         return (MyPosition) p;
     }
 
-    /** Determines whether a given vertex is valid. */
+    // Determines whether a given vertex is valid.
     protected MyVertex<V> checkVertex(Vertex<V> v)
             throws InvalidPositionException {
         if (v == null || !(v instanceof MyVertex))
@@ -160,7 +170,7 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         return (MyVertex<V>) v;
     }
 
-    /** Determines whether a given edge is valid. */
+    // Determines whether a given edge is valid.
     protected MyEdge<E> checkEdge(Edge<E> e)
             throws InvalidPositionException {
         if (e == null || !(e instanceof MyEdge))
@@ -168,24 +178,22 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         return (MyEdge<E>) e;
     }
 
-    /** Implementation of a decorable position by means of a hash
-     * table. */
+    // Implementation of a decorable position by means of a hash table.
     protected static class MyPosition<T>
             extends HashTableMap<Object,Object> implements DecorablePosition<T> {
-        /** The element stored at this position. */
+        // The element stored at this position.
         protected T elem;
-        /** Returns the element stored at this position. */
+        // Returns the element stored at this position.
         public T element() {
             return elem;
         }
-        /** Sets the element stored at this position. */
+        // Sets the element stored at this position.
         public void setElement(T o) {
             elem = o;
         }
     }
 
-    /** Returns a string representation of the vertex and edge lists,
-     * separated by a newline. */
+    // Returns a string representation of the vertex and edge lists, separated by a newline.
     public String toString() {
         return VList.toString() + "\n" +  EList.toString();
     }
@@ -212,70 +220,65 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
         return temp;
     }
 
-    /** Implementation of a vertex for an undirected adjacency list
-     * graph.  Each vertex stores its incidence container and position
-     * in the vertex container of the graph. */
+     //Implementation of a vertex for an undirected adjacency list
+     //graph.  Each vertex stores its incidence container and position
+     //in the vertex container of the graph.
     protected  class MyVertex<V>
             extends MyPosition<V> implements Vertex<V> {
-        /** Incidence container of the vertex. */
+        // Incidence container of the vertex.
         protected PositionList<Edge<E>> incEdges;
-        /** Position of the vertex in the vertex container of the graph. */
+        // Position of the vertex in the vertex container of the graph.
         protected Position<Vertex<V>> loc;
-        /** Constructs the vertex with the given element. */
+        // Constructs the vertex with the given element.
         MyVertex(V o) {
             elem = o;
             incEdges = new NodePositionList<Edge<E>>();
         }
-        /** Return the degree of a given vertex */
+        // Return the degree of a given vertex
         public int degree() {
             return incEdges.size();
         }
-        /** Returns the incident edges on this vertex. */
+        // Returns the incident edges on this vertex.
         public Iterable<Edge<E>> incidentEdges() {
             return incEdges;
         }
-        /** Inserts an edge into the incidence container of this vertex. */
+        // Inserts an edge into the incidence container of this vertex.
         public Position<Edge<E>> insertIncidence(Edge<E> e) {
             incEdges.addLast(e);
             return incEdges.last();
         }
-        /** Removes an edge from the incidence container of this vertex. */
+        //Removes an edge from the incidence container of this vertex.
         public void removeIncidence(Position<Edge<E>> p) {
             incEdges.remove(p);
         }
-        /** Returns the position of this vertex in the vertex container of
-         * the graph. */
+        // Returns the position of this vertex in the vertex container of the graph.
         public Position<Vertex<V>> location() {
             return loc;
         }
-        /** Sets the position of this vertex in the vertex container of
-         * the graph. */
+        // Sets the position of this vertex in the vertex container of  the graph.
         public void setLocation(Position<Vertex<V>> p) {
             loc = p;
         }
-        /** Returns a string representation of the element stored at this
-         * vertex. */
+        // Returns a string representation of the element stored at this  vertex.
         public String toString() {
             return elem.toString();
         }
     }
 
-    /** Implementation of an edge for an undirected adjacency list
-     * graph.  Each edge stores its endpoints (end vertices), its
-     * positions within the incidence containers of its endpoints, and
-     * position in the edge container of the graph. */
+    // Implementation of an edge for an undirected adjacency list
+    // graph.  Each edge stores its endpoints (end vertices), its
+    // positions within the incidence containers of its endpoints, and
+    // position in the edge container of the graph.
     protected class MyEdge<E> extends MyPosition<E> implements Edge<E> {
 
-        /** The end vertices of the edge. */
+        // The end vertices of the edge.
         protected MyVertex<V>[] endVertices;
-        /** The positions of the entries for the edge in the incidence
-         * containers of the end vertices. */
+        // The positions of the entries for the edge in the incidence containers of the end vertices.
         protected Position<Edge<E>>[] Inc;
-        /** The position of the edge in the edge container of the
-         * graph. */
+        // The position of the edge in the edge container of the  graph.
         protected Position<Edge<E>> loc;
 
-        /** Constructs an edge with the given endpoints and elements. */
+        // Constructs an edge with the given endpoints and elements.
         MyEdge (Vertex<V> v, Vertex<V> w, E o) {
             elem = o;
             endVertices = (MyVertex<V>[]) new MyVertex[2];
@@ -283,38 +286,37 @@ public class AdjacencyListGraph<V,E> implements Graph<V,E> {
             endVertices[1] = (MyVertex<V>)w;
             Inc = (Position<Edge<E>>[]) new Position[2];
         }
-        /** Returns the end vertices of the edge. There are always two
-         * elements in the returned array. */
+
+        // Returns the end vertices of the edge. There are always two  elements in the returned array.
         public MyVertex<V>[] endVertices() {
             return endVertices;
         }
-        /** Returns the positions of the edge in the incidence containers
-         * of its end vertices.  The returned array always contains two
-         * elements. */
+
+        // Returns the positions of the edge in the incidence containers
+        // of its end vertices.  The returned array always contains two
+        // elements.
         public Position<Edge<E>>[] incidences() {
             return Inc;
         }
-        /** Sets the positions of the edge in the incidence containers of
-         * its end vertices. */
+        // Sets the positions of the edge in the incidence containers of  its end vertices.
         public void setIncidences(Position<Edge<E>> pv, Position<Edge<E>> pw) {
             Inc[0] = pv;
             Inc[1] = pw;
         }
-        /** Returns the position of the edge in the edge container of the
-         * graph. */
+        // Returns the position of the edge in the edge container of the  graph.
         public Position<Edge<E>> location() {
             return loc;
         }
-        /** Sets the position of the edge in the edge container of the
-         * graph. */
+        // Sets the position of the edge in the edge container of the  graph.
         public void setLocation(Position<Edge<E>> p) {
             loc = p;
         }
-        /** Returns a string representation of the edge via a tuple of
-         * vertices. */
+        // Returns a string representation of the edge via a tuple of vertices.
         public String toString() {
             return element() + "(" + endVertices[0].toString() +
                     "," + endVertices[1].toString() + ")";
         }
     }
-}
\ No newline at end of file
+}
+
+*/
\ No newline at end of file
diff --git a/partition/ListPartition.java b/partition/ListPartition.java
index 448e083..64501c7 100644
--- a/partition/ListPartition.java
+++ b/partition/ListPartition.java
@@ -1,6 +1,14 @@
 package partition;
 
+import map.HashTableMap;
+import position.NodePositionList;
+import position.PositionList;
+import set.OrderedListSet;
 import set.Set;
+import utility.DefaultComparator;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
 
 /**
  * Created with xgiovio.macbookair.
@@ -10,30 +18,91 @@ import set.Set;
  */
 public class ListPartition <E> implements Partition<E> {
 
+    private HashTableMap<E,Set<E>> elementi;
+    private PositionList<Set<E>> partizione;
+
+    public ListPartition () {
+        elementi = new HashTableMap<E, Set<E>>();
+        partizione = new NodePositionList<Set<E>>();
+    }
+
 
 
     @Override
     public int size() {
-        return 0;
+        return elementi.size();
     }
 
     @Override
     public boolean isEmpty() {
-        return false;
+        return (size() == 0 );
     }
 
     @Override
     public Set<E> makeSet(E x) {
+        try {
+            OrderedListSet<E> o = new OrderedListSet<E>(x, new DefaultComparator<E>());
+            elementi.put(x, o);
+            partizione.addLast(o);
+            o.setLocation(partizione.last());
+            return o;
+        }
+        catch (InvalidKeyException e){
+
+        }
         return null;
+
     }
 
     @Override
     public Set<E> union(Set<E> A, Set<E> B) {
+        try {
+            if (A.size() > B.size()){
+                OrderedListSet<E> AA = (OrderedListSet<E>) A;
+                OrderedListSet<E> BB = (OrderedListSet<E>) B;
+                AA.fastUnion(BB);
+                partizione.remove(BB.location());
+                BB.setLocation(null);
+                Iterator<E> it = BB.list().iterator();
+                for (;it.hasNext();)
+                    elementi.put(it.next(),AA);
+                return AA;
+
+            } else {
+
+                OrderedListSet<E> AA = (OrderedListSet<E>) B;
+                OrderedListSet<E> BB = (OrderedListSet<E>) A;
+                AA.fastUnion(BB);
+                partizione.remove(BB.location());
+                BB.setLocation(null);
+                Iterator<E> it = BB.list().iterator();
+                for (;it.hasNext();)
+                    elementi.put(it.next(),AA);
+                return AA;
+
+
+            }
+        }
+        catch (InvalidKeyException e){
+
+        }
         return null;
+
     }
 
     @Override
     public Set<E> find(E x) {
+        try {
+            return elementi.get(x);
+        }
+        catch (InvalidKeyException e){
+
+        }
         return null;
     }
+
+    @Override
+    public String toString() {
+        return partizione.toString();
+    }
 }
diff --git a/set/OrderedListSet.java b/set/OrderedListSet.java
index bf5d8dd..b06f757 100644
--- a/set/OrderedListSet.java
+++ b/set/OrderedListSet.java
@@ -1,11 +1,13 @@
 package set;
 
 import position.NodePositionList;
+import position.Position;
 import position.PositionList;
 import utility.DefaultComparator;
 import utility.merge.MergeTemplate;
 
 import java.util.Comparator;
+import java.util.Iterator;
 
 /**
  * Created with xgiovio.macbookair.
@@ -17,6 +19,7 @@ import java.util.Comparator;
 public class OrderedListSet <E> implements Set<E> {
     private Comparator<E> c;
     private PositionList<E> L;
+    private Position<Set<E>> loc;
 
 
 
@@ -99,8 +102,33 @@ public class OrderedListSet <E> implements Set<E> {
 
 
 
+    public Set<E> fastUnion(Set<E> B){
+         OrderedListSet<E> BB  = (OrderedListSet<E>) B;
+        Iterator<E> it = BB.L.iterator();
+        for (;it.hasNext();)
+            L.addLast(it.next());
+        return this;
+    }
 
 
+    public E fastInsert(E x) {
+        L.addLast(x);
+        return x;
+    }
+
+
+    public Position<Set<E>> location (){
+        return loc;
+    }
+
+    public void setLocation (Position<Set<E>> in){
+        loc = in;
+    }
+
+    public PositionList<E> list (){
+        return L;
+    }
+
 
     //////////////////////// inner class override methods from merge template /////