Consider the following premises. For all x_18, x_18 is a taxi driver if and only if x_18 is a scientist. For all x_18, if x_18 were a sailor, then x_18 is a scientist. For all x_18, x_18 is a taxi driver. Can we infer the following from them? If we can, name the inference rule being used: Karen is taking a plane.
We cannot infer that from the premises. Therefore the answer is no.