What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 is a police officer or x_4 is a bartender. For all x_4, x_4 is a mechanic or x_4 is not a bartender. For all x_4, if x_4 were curious, then x_4 is a mechanic. For all x_4, x_4 is not a police officer or x_4 is curious.
For all x_4, x_4 is a bartender or x_4 is curious. For all x_4, if x_4 were a bartender, then x_4 is a mechanic.