Consider the following premises. For all x_2, if x_2 were an artist, then x_2 is writing a letter. If it is overcast, then William is writing a letter. If William writes a letter, then Barbara is a poet. It is overcast or William is an artist. Can we infer the following from them? If we can, name the inference rule being used: Elisabeth is not taking a plane.
We cannot infer that from the premises. Therefore the answer is no.