What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, if x_12 cooks, then x_12 is not an office clerk. For all x_12, x_12 is a mechanic or x_12 will work. For all x_12, x_12 will work if and only if x_12 is an office clerk. There is at least one x_12 for which if x_12 were a mechanic, then x_12 is an office clerk.
For all x_12, if x_12 works, then x_12 is an office clerk. For all x_12, if x_12 were an office clerk, then x_12 is working.