What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Mary were a nurse, then Jennifer is playing tennis. For all x_11, x_11 is an astronaut if and only if x_11 will play tennis. Jennifer is not an astronaut.
For all x_11, if x_11 were an astronaut, then x_11 is playing tennis. For all x_11, if x_11 plays tennis, then x_11 is an astronaut.