Consider the following premises. If Jennifer were an astronaut, then it is sunny. Elisabeth is not an electrician. If it is sunny, then Elisabeth is an electrician. If it is sunny, then Jennifer is an astronaut. Can we infer the following from them? If we can, name the inference rule being used: Jennifer is an astronaut.
 From the fact that if it is sunny, then Elisabeth is an electrician, and that Elisabeth is not an electrician we can infer that it is not sunny via modus tollens. From the fact that if Jennifer were an astronaut, then it is sunny, and that if it is sunny, then Jennifer is an astronaut we can infer that Jennifer is an astronaut if and only if it is sunny via biconditional introduction. Finally, from the fact that Jennifer is an astronaut if and only if it is sunny, and that it is not sunny we can infer that Jennifer is not an astronaut via biconditional elimination, which contradicts that Jennifer is an astronaut. Therefore, the answer is no.