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In addition, some projects attempt to gather the "commonsense knowledge" known to the average person into a database containing extensive knowledge about the world. Among the things a comprehensive commonsense knowledge base would contain are: objects, properties, categories and relations between objects; [77] situations, events, states and time; [78] causes and effects; [79] knowledge about knowledge (what we know about what other people know); [80] and many other, less well researched...