Consider the following premises. Sarah is not curious. If Sarah were curious, then Sarah is drinking water. For all x_16, if x_16 drinks water, then x_16 is curious. Can we infer the following from them? If we can, name the inference rule being used: Sarah is drinking water.
 From the fact that for all x_16, if x_16 drinks water, then x_16 is curious we can infer that if Sarah drinks water, then Sarah is curious via universal instantiation. From the fact that if Sarah were curious, then Sarah is drinking water, and that if Sarah drinks water, then Sarah is curious we can infer that Sarah is curious if and only if Sarah is drinking water via biconditional introduction. Finally, from the fact that Sarah is curious if and only if Sarah is drinking water, and that Sarah is not curious we can infer that Sarah is not drinking water via biconditional elimination, which contradicts that Sarah is drinking water. Therefore, the answer is no.