Consider the following premises. If it snows, then Linda is writing a letter. For all x_6, x_6 will play a game or x_6 will play squash. Richard is not playing a game or it is snowing. If Richard plays squash, then Linda is writing a letter. Can we infer the following from them? Linda is writing a letter.
 From the fact that for all x_6, x_6 will play a game or x_6 will play squash we can infer that Richard is playing a game or Richard is playing squash. From the fact that Richard is playing a game or Richard is playing squash, and that Richard is not playing a game or it is snowing we can infer that Richard is playing squash or it is snowing. Finally, from the fact that if Richard plays squash, then Linda is writing a letter, that if it snows, then Linda is writing a letter, and that Richard is playing squash or it is snowing we can infer that Linda is writing a letter. Therefore, the answer is yes.