7. The storage media of claim 6 , where in the first provisional cost and the second provisional cost are further based on a probability of the conditional expression being true.
7. The storage media of claim 6 , where in the first provisional cost and the second provisional cost are further based on a probability of the conditional expression being true. 8. The storage media of claim 7 , wherein the first provisional cost is computed for the conditional expression as a product of the number of expressions being true in response to the conditional expression being positive, and the probability of the conditional expression being true.