What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_6, x_6 is a sailor or x_6 is an office clerk. For all x_6, x_6 will work. For all x_6, x_6 is not an office clerk. For all x_6, x_6 is not a sailor or x_6 will take a plane.
For all x_6, x_6 is an office clerk or x_6 will take a plane can be inferred via the universal resolution rule.