Don't get me started on how real commonsense reasoning requires partitioned knowledge bases, modal logic, temporal logic, social logic (Jim thinks that Mary believes ...), all sorts of complications for which a complete and consistent decision procedure is just unthinkable. I think you could put together a logic system for families of problems in certain domains and accomplish a lot but there is no general logic for real life and efforts like Cyc have gotten stuck in the mud or gone down in flames.
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