Consider the following premises. For all x_6, if x_6 plays a game, then x_6 is a janitor. There is at least one x_6 for which if x_6 plays squash, then x_6 is playing tennis. For all x_6, x_6 will play a game or x_6 will not play tennis. Can we infer the following from them? If we can, name the inference rule being used: For all x_6, the fact that x_6 plays squash does not imply that x_6 is a janitor.
That contradicts the premises. Therefore the answer is no.