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Suppose we have a tuple-independent database (TID) named D and we have to evaluate if a boolean query Q(D) is safe or not safe using the intensional query evaluation approach. I suppose we have to compute the lineage of Q and reason with that, but I am not quite sure of how to do it. How can one compute the lineage of a boolean query Q over a probabilistic database D and use that to evaluate the safeness of the query?

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