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, x_13 is a soldier if and only if x_13 will play squash. For all x_13, x_13 is a soldier if and only if x_13 will take a plane. For all x_13, x_13 will not drive a car. For all x_13, x_13 will take a plane if and only if x_13 will drive a car. For all x_13, if x_13 plays squash, then x_13 is an artist. For all x_13, if x_13 were an artist, then x_13 is playing squash.
For all x_13, x_13 will play squash if and only if x_13 is an artist. For all x_13, x_13 is an artist if and only if x_13 will play squash. For all x_13, if x_13 were a soldier, then x_13 is playing squash. For all x_13, if x_13 were a soldier, then x_13 is taking a plane. For all x_13, if x_13 takes a plane, then x_13 is driving a car. For all x_13, if x_13 plays squash, then x_13 is a soldier. For all x_13, if x_13 takes a plane, then x_13 is a soldier. For all x_13, if x_13 drives a car, then x_13 is taking a plane. For all x_13, x_13 will not take a plane.