Consider the following premises. There is at least one x_6 for which x_6 is not a server. For all x_6, x_6 is a server if and only if x_6 will play squash. For all x_6, x_6 will play squash if and only if x_6 is a poet. Can we infer the following from them? For all x_6, x_6 is a poet.
 From the fact that for all x_6, x_6 is a server if and only if x_6 will play squash, and that there is at least one x_6 for which x_6 is not a server we can infer that there is at least one x_6 for which x_6 will not play squash. Finally, from the fact that for all x_6, x_6 will play squash if and only if x_6 is a poet, and that there is at least one x_6 for which x_6 will not play squash we can infer that there is at least one x_6 for which x_6 is not a poet, which contradicts that For all x_6, x_6 is a poet. Therefore, the answer is no.