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 an artist if and only if x_13 is a soldier. For all x_13, x_13 will not take a plane. For all x_13, if x_13 were a cashier, then x_13 is an artist. For all x_13, if x_13 plays squash, then x_13 is a cashier. There is at least one x_13 for which if x_13 were a soldier, then x_13 is taking a plane.
There is at least one x_13 for which x_13 is not a soldier. 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 a soldier. For all x_13, if x_13 were a soldier, then x_13 is an artist.