What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_4, z_4 is a scientist if and only if z_4 is bored. For all z_4, z_4 is bored. There is at least one z_4 for which z_4 will drive a car.
There is at least one z_4 for which z_4 will drive a car and z_4 is bored. There is at least one z_4 for which z_4 is bored and z_4 will drive a car. For all z_4, if z_4 were a scientist, then z_4 is bored. For all z_4, if z_4 were bored, then z_4 is a scientist.