History of Data structure

	Revision 10 . . December 1, 2001 4:49 pm by Uriyan
	Revision 9 . . December 1, 2001 1:53 pm by (logged).108.14.xxx [trees are a subclass of graphs]
	Revision 8 . . (edit) October 27, 2001 11:36 pm by (logged).149.37.xxx

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Added: 14a15

**Deque