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, if x_4 were an electrician, then x_4 is cooking. There is at least one x_4 for which if x_4 cooks, then x_4 is an electrician. For all x_4, x_4 will cook if and only if x_4 is an electrician.
There is at least one x_4 for which x_4 will cook if and only if x_4 is an electrician. There is at least one x_4 for which x_4 is an electrician if and only if x_4 will cook. For all x_4, if x_4 cooks, then x_4 is an electrician. For all x_4, if x_4 were an electrician, then x_4 is cooking.