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             1.7 The Semantic Network

             The most general and oldest artificial intelligence scheme
             for representing knowledge is the semantic network. A
             semantic network is a collection of objects called nodes.
             The nodes are connected together by links. Ordinarily, both
             the links and the nodes are labelled [4]. A drawing of a
             semantic network contains bubbles to represent the nodes,
             and lines connecting the nodes to represent the links. Both
             nodes and links are labelled. The drawing looks just like a
             PERT or CP/M chart. It is also the drawing used to represent
             a state machine.

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