Consider the following premises. For all x_14, if x_14 were a mechanic, then x_14 is drinking water. For all x_14, if x_14 sleeps, then x_14 is drinking water. For all x_14, x_14 is a mechanic. Can we infer the following from them? If we can, name the inference rule being used: Jessica is not drinking water.
 From the fact that for all x_14, x_14 is a mechanic we can infer that for all x_14, x_14 is a mechanic or x_14 will sleep via universal addition. Finally, from the fact that for all x_14, if x_14 were a mechanic, then x_14 is drinking water, that for all x_14, if x_14 sleeps, then x_14 is drinking water, and that for all x_14, x_14 is a mechanic or x_14 will sleep we can infer that for all x_14, x_14 will drink water via universal disjunction elimination, which contradicts that Jessica is not drinking water. Therefore, the answer is no.