Paragraph about Scientific software

On the *SR* model, an explanation of why some member
*x* of the class characterized by attribute *A* has
attribute *B* consists of the following information:

To employ one of Salmon's examples, suppose Scientific software we want to construct an
*SR* explanation of why *x* who has a strep infection =
*S* , recovers quickly = *Q*. Let *T*
(-*T*) according to whether *x* is (is not) treated with
penicillin, and *R(-R*) = according to whether the subject has
a penicillin-resistant strain. Assume for the sake of argument that no
other factors are relevant to quick recovery. There are four possible
combinations mathlab of these properties: *T.R, -T.R, T.-R, -T.-R*, but
let us assume that P(*Q|S.T.R*) = P(*Q|S.-T.R*) =
P(*Q|S.-T.-R*) ≠ P(*Q|S. T.-R*). That is, the
probability of quick recovery, given that one has strep, is the same
for those who have the resistant strain regardless of whether or not
they are treated and also the same for those who have not been
treated. By contrast, the probability of recovery is different
(presumably greater) among those with strep who have been treated and
do not have the resistant strain.