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 doctor if and only if z_4 will go running. For all z_4, z_4 is a doctor if and only if z_4 is bored. For all z_4, z_4 will go running or z_4 will make tea. There is at least one z_4 for which z_4 is not bored.
For all z_4, if z_4 were a doctor, then z_4 is running. For all z_4, if z_4 were a doctor, then z_4 is bored. For all z_4, if z_4 goes running, then z_4 is a doctor. For all z_4, if z_4 were bored, then z_4 is a doctor. There is at least one z_4 for which z_4 is not a doctor.