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each node is a word, representing a concept (like bird). Within each node is stored a set of properties (like "can fly" or "has wings") as well as links to other nodes (like chicken). A node is directly linked to those nodes of which it is either a subclass or superclass (i.e., bird would be connected to both chicken and animal). Properties are stored at the highest category level to which they apply; for example, "is yellow" would be stored with canary, "has wings" would be stored with bird (one level up), and "can move" would be stored with

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