What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, if x_15 were curious, then x_15 is an office clerk. For all x_15, if x_15 were an office clerk, then x_15 is curious. If Barbara were an office clerk, then Robert is a cashier. If Robert were a cashier, then it is sunny.
If Barbara were an office clerk, then it is sunny. For all x_15, x_15 is curious if and only if x_15 is an office clerk. For all x_15, x_15 is an office clerk if and only if x_15 is curious.