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Solution to part (b)

"a isn't a logical consequence of KB" means there exists a model of KB in which a is false.

To show why a isn't a logical consequence of KB, we can give such a model. The minimal model will always be one such model. This model has {h,e,d,c,g} all true and {a,b,f} all false.

Computational Intelligence online material, ©David Poole, Alan Mackworth and Randy Goebel, 1998

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