Markov blanket is mainly used to show the conditional independent of a node.

Like variable Waay is only dependent on it's parents RWa and CSa , it's children and it's co-parents. In this case, there is no children and co-parents for Waay. So to calculate the probability of Waay it is only required to know RWa and CSa. The variables which are outside the blanket could be ignored.

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