Consider the following premises. Elisabeth is not an office clerk. Susan is playing squash if and only if Elisabeth is an office clerk. For all x_8, if x_8 plays squash, then x_8 is a sailor. For all x_8, if x_8 were a sailor, then x_8 is playing squash. Can we infer the following from them? Susan is a sailor.
 From the fact that for all x_8, if x_8 were a sailor, then x_8 is playing squash, and that for all x_8, if x_8 plays squash, then x_8 is a sailor we can infer that for all x_8, x_8 is a sailor if and only if x_8 will play squash. From the fact that for all x_8, x_8 is a sailor if and only if x_8 will play squash we can infer that Susan is a sailor if and only if Susan is playing squash. From the fact that Susan is playing squash if and only if Elisabeth is an office clerk, and that Elisabeth is not an office clerk we can infer that Susan is not playing squash. Finally, from the fact that Susan is a sailor if and only if Susan is playing squash, and that Susan is not playing squash we can infer that Susan is not a sailor, which contradicts that Susan is a sailor. Therefore, the answer is no.