Abstract
This paper treats two dynamic memories, one proposed by Aho and Ullman and the other proposed by Stone. The first memory has the property that every item is accessible in 0 (log2 N) steps, and that after access to the first two items of a block of contiguous items, each successive item can be accessed in unit time. In this paper we give a new derivation of the properties, and indicate minor variations and improvements of the memory-access algorithm.

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