What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Barbara drinks water, then Elisabeth is a sailor. For all x_7, x_7 is a sailor or x_7 will not take a plane. Elisabeth is taking a plane or Barbara is drinking water.
For all x_7, if x_7 takes a plane, then x_7 is a sailor.