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Working memory
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Working memory contains all of the temporary knowledge available for cueing
the retrieval of long-term knowledge from production memory and initiating
actions in the external environment.  Working memory is organized into
{objects}, each of which has a unique symbol called its *identifier*.  An
object consists of a set of *augmentations* and *preferences* for those
augmentations.  Augmentations and *acceptable preferences* for context
augmentations are *working memory elements*, because they are in working
memory and can be matched by productions.

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Symbols
Objects and augmentations
Goal contexts
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