Consider the following premises. If David were a server, then Richard is drinking water. If Joseph plays squash, then Jennifer is taking a plane. If Jennifer takes a plane, then David is a server. If John were an artist, then Joseph is playing squash. Can we infer the following from them? If we can, name the inference rule being used: If John were an artist, then Richard is drinking water.
 From the fact that if John were an artist, then Joseph is playing squash, and that if Joseph plays squash, then Jennifer is taking a plane we can infer that if John were an artist, then Jennifer is taking a plane via transitivity. From the fact that if Jennifer takes a plane, then David is a server, and that if David were a server, then Richard is drinking water we can infer that if Jennifer takes a plane, then Richard is drinking water via transitivity. Finally, from the fact that if John were an artist, then Jennifer is taking a plane, and that if Jennifer takes a plane, then Richard is drinking water we can infer that if John were an artist, then Richard is drinking water via transitivity. Therefore, the answer is yes.