DList dlist = new DList();
dlist.add( "x" );
dlist.add( "l" );
dlist.add( "x" );
dlist.add( "g" );
dlist.add( "s" );
dlist.add( "s" );
System.out.println( "dlist = " + dlist );
dlist.reverse();
System.out.println( "After dlist.reverse() = " + dlist );
dlist.remove( "x" );
System.out.println( "After dlist.remove( x ) = " + dlist );
dlist.unique();
System.out.println( "After dlist.unique() = " + dlist );
