List<LineString> lines = map.getList();
List<LineString> linesPurified = new LinkedList<LineString>() ;

    for (ListIterator l = lines.listIterator(); l.hasNext();)
    {
        LineString line_graph = (LineString) l.next();
        int aux1=0, aux2=0;

        for(ListIterator m = (ListIterator) lines.listIterator(); m.hasNext();)
        {
            LineString compare = (LineString) m.next();

            for(int i=0;i<compare.getCoordinates().length;i++)
            {
                if( line_graph.getCoordinates()[0] == compare.getCoordinates()[i] )aux1++;
                if( line_graph.getCoordinates()[line_graph.getCoordinates().length-1] == compare.getCoordinates()[i] ) aux2++;

            }
        }

    if (aux1>1 || aux2>1)linesPurified.add(line_graph);

    }