Consider the following premises. If it is cold, then Robert is working. If Robert were a lawyer, then Robert is working. For all x_17, if x_17 works, then x_17 is a lawyer. Robert is not a lawyer. If John plays tennis, then it is cold. Can we infer the following from them? If we can, name the inference rule being used: David is a janitor.
We cannot infer that from the premises. Therefore the answer is no.