Consider the following premises. For all x_11, x_11 will not drink water. There is at least one x_11 for which x_11 will drink water or x_11 is not bored. For all x_11, x_11 is bored if and only if x_11 is a sailor. Can we infer the following from them? For all x_11, x_11 is a sailor.
 From the fact that there is at least one x_11 for which x_11 will drink water or x_11 is not bored we can infer that there is at least one x_11 for which if x_11 were bored, then x_11 is drinking water. From the fact that there is at least one x_11 for which if x_11 were bored, then x_11 is drinking water, and that for all x_11, x_11 will not drink water we can infer that there is at least one x_11 for which x_11 is not bored. Finally, from the fact that for all x_11, x_11 is bored if and only if x_11 is a sailor, and that there is at least one x_11 for which x_11 is not bored we can infer that there is at least one x_11 for which x_11 is not a sailor, which contradicts that For all x_11, x_11 is a sailor. Therefore, the answer is no.