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C00002 00002	4.7 	Critique.
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4.7 	Critique.

	The most glaring flaw  in the present data structure  is that
there is two of them: a 2-D CRE structure and a 3-D GEOMED structure.
This difficulty  arose  because the  directly addressible  memory  on
Stanford A.I.  computer varies between  100K to 150K  words. Although
the PDP-KA10  address space is 256K, there was no "virtual memory" or
paging at Stanford and so the problem had to broken up in someway.