Consider the following premises. For all z, z will go running. For all z, if z climbs a mountain, then z is not running. There is at least one z for which z will climb a mountain or z is not a sailor. Can we infer the following from them? For all z, z is a sailor.
 From the fact that there is at least one z for which z will climb a mountain or z is not a sailor we can infer that there is at least one z for which if z were a sailor, then z is climbing a mountain. From the fact that for all z, if z climbs a mountain, then z is not running, and that for all z, z will go running we can infer that for all z, z will not climb a mountain. Finally, from the fact that there is at least one z for which if z were a sailor, then z is climbing a mountain, and that for all z, z will not climb a mountain we can infer that there is at least one z for which z is not a sailor, which contradicts that For all z, z is a sailor. Therefore, the answer is no.