Consider the following premises. If Sarah were a janitor, then it is raining. If William plays tennis, then Sarah is a janitor. If it rains, then it is snowing. William is playing tennis or Charles is a doctor. If Charles were a doctor, then it is raining. Can we infer the following from them? If we can, name the inference rule being used: Patricia is not fast.
We cannot infer that from the premises. Therefore the answer is no.