What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_2, z_2 will play squash if and only if z_2 is a musician. For all z_2, z_2 will take a plane if and only if z_2 will play squash. For all z_2, z_2 is not a soldier. For all z_2, z_2 is a soldier if and only if z_2 is a musician.
For all z_2, if z_2 plays squash, then z_2 is a musician. For all z_2, if z_2 takes a plane, then z_2 is playing squash. For all z_2, if z_2 were a soldier, then z_2 is a musician. For all z_2, if z_2 were a musician, then z_2 is playing squash. For all z_2, if z_2 plays squash, then z_2 is taking a plane. For all z_2, if z_2 were a musician, then z_2 is a soldier. For all z_2, z_2 is not a musician.