Consider the following premises. For all x_4, x_4 is a scientist if and only if x_4 is a server. For all x_4, if x_4 were a scientist, then x_4 is drinking water. For all x_4, if x_4 drinks water, then x_4 is a scientist. Can we infer the following from them? There is at least one x_4 for which the fact that x_4 were a server does not imply that x_4 is drinking water.
 From the fact that for all x_4, if x_4 drinks water, then x_4 is a scientist, and that for all x_4, if x_4 were a scientist, then x_4 is drinking water we can infer that for all x_4, x_4 will drink water if and only if x_4 is a scientist. From the fact that for all x_4, x_4 will drink water if and only if x_4 is a scientist we can infer that for all x_4, if x_4 were a scientist, then x_4 is drinking water. From the fact that for all x_4, x_4 is a scientist if and only if x_4 is a server we can infer that for all x_4, if x_4 were a server, then x_4 is a scientist. Finally, from the fact that for all x_4, if x_4 were a server, then x_4 is a scientist, and that for all x_4, if x_4 were a scientist, then x_4 is drinking water we can infer that for all x_4, if x_4 were a server, then x_4 is drinking water, which contradicts that There is at least one x_4 for which the fact that x_4 were a server does not imply that x_4 is drinking water. Therefore, the answer is no.