What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_1, x_1 is not an electrician. For all x_1, if x_1 sleeps, then x_1 is an electrician. There is at least one x_1 for which x_1 will work if and only if x_1 will sleep.
For all x_1, x_1 will not sleep. There is at least one x_1 for which if x_1 works, then x_1 is sleeping. There is at least one x_1 for which if x_1 sleeps, then x_1 is working.