Consider the following premises. For all x_12, x_12 is not a taxi driver or x_12 is a bartender. For all x_12, if x_12 climbs a mountain, then x_12 is a taxi driver. There is at least one x_12 for which x_12 will climb a mountain or x_12 will go running. For all x_12, if x_12 goes running, then x_12 is a taxi driver. Can we infer the following from them? There is at least one x_12 for which x_12 is fast or x_12 is a bartender.
 From the fact that for all x_12, if x_12 climbs a mountain, then x_12 is a taxi driver, that for all x_12, if x_12 goes running, then x_12 is a taxi driver, and that there is at least one x_12 for which x_12 will climb a mountain or x_12 will go running we can infer that there is at least one x_12 for which x_12 is a taxi driver. From the fact that there is at least one x_12 for which x_12 is a taxi driver we can infer that there is at least one x_12 for which x_12 is a taxi driver or x_12 is fast. Finally, from the fact that there is at least one x_12 for which x_12 is a taxi driver or x_12 is fast, and that for all x_12, x_12 is not a taxi driver or x_12 is a bartender we can infer that there is at least one x_12 for which x_12 is fast or x_12 is a bartender. Therefore, the answer is yes.