Consider the following premises. There is at least one x_8 for which x_8 is an electrician if and only if x_8 will sleep. For all x_8, x_8 is a scientist or x_8 will not sleep. Can we infer the following from them? If we can, name the inference rule being used: For all x_8, the fact that x_8 were an electrician does not imply that x_8 is a scientist.
 From the fact that there is at least one x_8 for which x_8 is an electrician if and only if x_8 will sleep we can infer that there is at least one x_8 for which if x_8 were an electrician, then x_8 is sleeping via existential biconditional elimination. Finally, from the fact that for all x_8, x_8 is a scientist or x_8 will not sleep we can infer that for all x_8, if x_8 sleeps, then x_8 is a scientist via universal rewriting, which contradicts that For all x_8, the fact that x_8 were an electrician does not imply that x_8 is a scientist. Therefore, the answer is no.