Consider the following premises. It is snowing if and only if Thomas is an office clerk. For all x_9, x_9 is a bartender. It is snowing. Can we infer the following from them? If we can, name the inference rule being used: Thomas is an office clerk and Linda is a bartender.
 From the fact that it is snowing if and only if Thomas is an office clerk we can infer that if it snows, then Thomas is an office clerk via biconditional elimination. From the fact that if it snows, then Thomas is an office clerk, and that it is snowing we can infer that Thomas is an office clerk via modus ponens. From the fact that for all x_9, x_9 is a bartender we can infer that Linda is a bartender via universal instantiation. Finally, from the fact that Thomas is an office clerk, and that Linda is a bartender we can infer that Thomas is an office clerk and Linda is a bartender via conjunction. Therefore, the answer is yes.