Consider the following premises. There is at least one x_10 for which x_10 is poor if and only if x_10 is a sailor. For all x_10, if x_10 were a sailor, then x_10 is making tea. For all x_10, if x_10 makes tea, then x_10 is a sailor. Can we infer the following from them? If we can, name the inference rule being used: For all x_10, the fact that x_10 makes tea does not imply that x_10 is poor.
That contradicts the premises. Therefore the answer is no.