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In: Machine Learning Journal, 3 (4), pp261-283, Netherlands: Kluwer (1989) http://www.cs.utexas.edu/users/pclark/papers/cn2.ps

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In: Machine Learning Journal, 3 (4), pp261-283, Netherlands: Kluwer (1989) http://www.cs.utexas.edu/users/pclark/papers/cn2.ps

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