Consider the following premises. Robert is a scientist or Joseph is not a politician. If Robert were a scientist, then Sarah is working. If Sarah works, then Joseph is a politician. Can we infer the following from them? The fact that Sarah works does not imply that Robert is a scientist.
 From the fact that Robert is a scientist or Joseph is not a politician we can infer that if Joseph were a politician, then Robert is a scientist. Finally, from the fact that if Sarah works, then Joseph is a politician, and that if Joseph were a politician, then Robert is a scientist we can infer that if Sarah works, then Robert is a scientist, which contradicts that The fact that Sarah works does not imply that Robert is a scientist. Therefore, the answer is no.