Consider the following premises. For all x_6, if x_6 were sad, then x_6 is an astronaut. There is at least one x_6 for which if x_6 were a sailor, then x_6 is sad. For all x_6, if x_6 were a writer, then x_6 is sad. For all x_6, if x_6 were an astronaut, then x_6 is a writer. Can we infer the following from them? If we can, name the inference rule being used: For all x_6, the fact that x_6 were a sailor does not imply that x_6 is an astronaut.
That contradicts the premises. Therefore the answer is no.