 is a homogenous partition of S with respect to Q. The SR explanation of x’s recovery will consist of a statement of the probability of quick recovery among all those with strep ((i) above), a statement of the probability of recovery in each of the two cells of the above partition ((ii) above), and the cell to which x belongs, which is \(S.T.R\) ((iii) above). Intuitively, the idea is that this information tells us about the relevance of each of the possible combinations of the properties T and R to quick recovery among those with strep and is explanatory for just this reason.