Consider the following premises. For all x_17, x_17 is an electrician if and only if x_17 will take a plane. For all x_17, x_17 will not take a plane. It is sunny. For all x_17, x_17 is an electrician or x_17 is a sailor. Can we infer the following from them? If we can, name the inference rule being used: Jessica is not a sailor.
 From the fact that for all x_17, x_17 is an electrician if and only if x_17 will take a plane, and that for all x_17, x_17 will not take a plane we can infer that for all x_17, x_17 is not an electrician via universal biconditional elimination. Finally, from the fact that for all x_17, x_17 is an electrician or x_17 is a sailor, and that for all x_17, x_17 is not an electrician we can infer that for all x_17, x_17 is a sailor via universal disjunctive syllogism, which contradicts that Jessica is not a sailor. Therefore, the answer is no.