What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 will not take a plane or x_6 is curious. For all x_6, x_6 is a janitor if and only if x_6 is a sailor. For all x_6, x_6 is not a janitor. For all x_6, x_6 will take a plane or x_6 is a sailor.
For all x_6, x_6 is a sailor or x_6 is curious. For all x_6, if x_6 were a janitor, then x_6 is a sailor. For all x_6, if x_6 were a sailor, then x_6 is a janitor. For all x_6, x_6 is not a sailor.