What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If John were poor, then Robert is a cashier. If Robert were a cashier, then Michael is a mechanic. If it is overcast, then John is poor. It is snowing or Michael is not a mechanic.
If John were poor, then Michael is a mechanic. If it is overcast, then Robert is a cashier. If Michael were a mechanic, then it is snowing.