Single Linked List

	  0	    1	    2
	------	 -------  ------
	| 0-1| ->| 4-N |  | 3- |
	------	 -------  ------

	  0	    1	    2
	------	 -------  ------
	| 0-2| ->| 4-N |  | 3-1|
	------	 -------  ------

Double Linked List

	    0	      1	         2
	--------   ---------  ---------
	| 0-N/1| ->| 4-0/N |  | 3-N/N |
	--------   ---------  ---------

	    0	      1	         2
	--------   ---------  ---------
	| 0-N/2| ->| 4-2/N |  | 3-0/1 |
	--------   ---------  ---------