What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, if x_13 were a writer, then x_13 is a police officer. For all x_13, x_13 will play squash if and only if x_13 is a police officer. For all x_13, x_13 will take a plane or x_13 is a nurse. There is at least one x_13 for which if x_13 were a nurse, then x_13 is a writer. For all x_13, x_13 will not take a plane.
There is at least one x_13 for which if x_13 were a nurse, then x_13 is a police officer. For all x_13, x_13 is a nurse. For all x_13, if x_13 plays squash, then x_13 is a police officer. For all x_13, if x_13 were a police officer, then x_13 is playing squash.