Consider the following premises. If Joseph were bored, then it is raining. If it rains, then Patricia is taking a plane. If Michael plays squash, then Joseph is bored. If Richard were a lawyer, then Michael is playing squash. Can we infer the following from them? If Richard were a lawyer, then Patricia is taking a plane.
 From the fact that if Joseph were bored, then it is raining, and that if it rains, then Patricia is taking a plane we can infer that if Joseph were bored, then Patricia is taking a plane. From the fact that if Michael plays squash, then Joseph is bored, and that if Joseph were bored, then Patricia is taking a plane we can infer that if Michael plays squash, then Patricia is taking a plane. Finally, from the fact that if Richard were a lawyer, then Michael is playing squash, and that if Michael plays squash, then Patricia is taking a plane we can infer that if Richard were a lawyer, then Patricia is taking a plane. Therefore, the answer is yes.