Consider the following premises. For all x_10, if x_10 were a taxi driver, then x_10 is a mechanic. For all x_10, x_10 is a janitor or x_10 will play squash. There is at least one x_10 for which if x_10 were a janitor, then x_10 is a taxi driver. For all x_10, if x_10 plays squash, then x_10 is a taxi driver. For all x_10, if x_10 drinks water, then x_10 is a mechanic. Can we infer the following from them? There is at least one x_10 for which x_10 is a mechanic.
 From the fact that there is at least one x_10 for which if x_10 were a janitor, then x_10 is a taxi driver, that for all x_10, if x_10 plays squash, then x_10 is a taxi driver, and that for all x_10, x_10 is a janitor or x_10 will play squash we can infer that there is at least one x_10 for which x_10 is a taxi driver. From the fact that there is at least one x_10 for which x_10 is a taxi driver we can infer that there is at least one x_10 for which x_10 is a taxi driver or x_10 will drink water. Finally, from the fact that for all x_10, if x_10 were a taxi driver, then x_10 is a mechanic, that for all x_10, if x_10 drinks water, then x_10 is a mechanic, and that there is at least one x_10 for which x_10 is a taxi driver or x_10 will drink water we can infer that there is at least one x_10 for which x_10 is a mechanic. Therefore, the answer is yes.