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4. (2pts)Given the following Bayes network, compute P(A=T, C=T). Show the key steps. P(B) P(-B) B A P(A) P(-A) 0.6 0.4 0.2 0.8 C P(C) P(-C) 0 1 - HTIMID S T1 - ST1 00 0.8 0.2 0.9 0.1 0.99 0.01