What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_9 for which x_9 is an electrician if and only if x_9 is fast. For all x_9, if x_9 cooks, then x_9 is taking a plane. For all x_9, x_9 is not an electrician. For all x_9, if x_9 takes a plane, then x_9 is fast.
For all x_9, if x_9 cooks, then x_9 is fast. There is at least one x_9 for which if x_9 were an electrician, then x_9 is fast. There is at least one x_9 for which if x_9 were fast, then x_9 is an electrician. There is at least one x_9 for which x_9 is not fast.